Might as well attempt to defend myself so here we go
If you don't feel like Talon is as threatening as it used to, then you must be doing something wrong lol.
Wouldn't I be doing something right if none of my teams are particularly threatened by Smogon Bird? Not as threatening as it used to be =/= not threatening. Talonflame is at the point where I can look at the team preview and figure out what type of set it is so that I can adjust my playstyle accordingly. Yeah I'm sometimes wrong but that's life and I move on.
The transition from XY to ORAS couldn't have been kinder to Smog bird. Basically every really good new Mega in the tier apart from Mega Diancie is checked in some way by Talonflame; Mega Metagross, Mega Gallade, Mega Lop, Mega Sceptile, Mega Sableye to an extent, and Mega Altaria.
Ignoring Sableye for this part since I agree with it, but of other other mons you listed, all of them have a way of dealing a shiton of damage to Talon should it choose to switch in. Metagross does 51% on average to CB. Talon with meteor mash, while bulkier variants (120 HP) take 45% on average, leaving it weakened and forced to roost. If rocks are up (I will address this issue later on in this post), Talon straight up loses if gross packs BP (which is really fucking good on him btw). If Talon comes in on Zen Headbutt or Thunder Punch it straight up loses. 120 HP Talon loses 50% to Gallade's CC, and both Knock Off and Zen Headbutt do respectable damage, and straight up KO if Gallade has boosted or rocks are up. Talon can switch in on Sceptile, yeah, but D Pulse does a clean 66% to 120 HP variants (I list this because its one of the HP numbers used for SD). Talon only beats Altaria if its the physical DD variant because bulky variants can outlast it. Mega Lopunny does 46% on the switch with HJK, while return does a clean 76%.
The point of all that is that Talon can only revenge these mons, as bar Sceptile, it takes a shiton of damage from even resisted hits do upwards of 50%. I realize what you were saying with the checking thing but honestly talonflames bulk is so bad that it can be a liability if it has already used brave bird once or twice, as it can be worn down by recoil damage.
On top of that, it still checks a fuck ton of other things, but I don't feel like listing all of them out because all you have to do is just look at the rankings yourself and see just the sheer amount of Pokemon that hate it.
Like above, Talon can only revenge kil many of the things it 'checks'. And that's my problem with it. The fact that it has very few switch in opportunities (talking about offensive sets here - the most common ones), leaves a bad impression when it's supposed to 'check' half the tier.
Almost all of the Pokemon you mentioned that trouble it, were already so prevalent in the tier already bar Mega Diancie, and Talonflame still managed to be a huge bitch regardless just because of how easy it was to weaken said checks/counters and beat everything at +2.
At this point I honestly feel like you're really overselling Talonflame. I've already said that he's still a threat in my original post, but you're making him seem like some sort of god that he isn't. Yes, Talonflame is annoying for teams. No, that doesn't mean its A+ in my eyes, when many teams are prepared for it. Back in XY, Birdspam existed, which allowed these Birdspam teams to suicide themselves to weaken these checks so that the other bird can sweep. Now, Pinsir, Talons partner in crime, has lost a lot of viability and Birdspam doesn't exist anymore. In the hundreds of ORAS games I've played on bothe the ladder and against friends, I've seen a small handful of Birdspam teams, which just goes to show their loss of viability.
CB Talon isn't a bad set, but I agree it's not the best set at the moment just because of how annoying it is losing so much momentum by being locked into Flare Blitz or Brave Bird at certain times. Now the specially defensive stallbreaker sets as well as the plain old SD Sharp Beak sets are basically satan and it does so much work against offensive teams it's not even funny actually.
How exactly does the SD set put in so much work against offensive teams? Every offensive team I've run and seen have at least one hard check and sometimes even multiple soft checks to the bird. I mean, it puts in work for sure but you're drastically overselling its traits. A well played offensive team can apply enough pressure to force Talonflame in early where it racks up recoild damage to the point where it can be killed the next time it comes in. And if it manages to keep rocks up throughout the game (which should be a top priority against a team with Talonflame), then it's a lot less threatening.
Balance teams struggle against as well regardless of using Heatran or Rotom-W, simply because like I mentioned above, many of them can be weakened or easily exploited enough so that Talon has no problem sweeping later. Scarf Landorus-T for example can only switch into a Sharp Beak Brave Bird like one time reliably, and then from that point on it has to rely on checking it and praying that it doesn't get to +2 before it can come in.
You forgot about Slowbro, Rhyperior, and Raikou as bird checks on balance teams. And yes, they can be worn down, but that applies to any check for any sweeper and shouldn't be your main argument for keeping Talonflame in A+. Only the Sp def Taunt / wisp set truly gives balance teams trouble imo, as it shuts down defensive Pokémon with taunt and roosts off the damage. Additionally, the SpDef set can't be slapped onto any team, as it only works on balance and semi stall, as it kills too much momentum for offensive teams.
It's still one of the most reliable and terrifying sweepers in the metagame that has the ability to take on multiple archetypes as well as check some of the most dominant Pokemon in OU. Saying that it's not on par with some of OU's is a huge exaggeration, and there's no way in hell Talonflame has gotten fucked by the ORAS transition as hard as you're saying it is.
Once again, you're overselling Talonflame. It's not very strong without a boost and the meta is at a point where Talonflame has to work to beat a team, just like a Diancie or Pinsir would have to work for their wins. It doesn't 6-0 teams and it requires quite a bit of team support to fully carry out its job on a Team. If its 6-0ing then something is wrong with the team that has been 6-0ed because it's not terribly hard to keep it in check like the rest of the meta.
Also when did I say ORAS fucked it over lmao. I said it's not as threatening, there's a difference.
Also fuck the 4x weak to SR argument. It's become one of those filler arguments that's used when there's nothing else worth saying. I think we know at this point that Talon hates SR, so using that as an argument to drop it when the whole point of your post was implying that Talon should drop because of how it's gotten worse since XY. SR have always been around, and that's never going to change. Using it as a filler argument just makes posts seem less credible tbh.
I literally mentioned it in my post one time. ONE TIME. So for the love of god don't attack my credibility by blowing one small mention out of proportion.
But since you brought it up I might as well make a comparison: Zard Y. It, too, has a 4x SR weakness. It, too, puts in work against offense and balance. It, too, requires quite a bit of team support. Does it mean its bad? No. It's sitting comfortably in A rank as one of the better A ranks out there. Now back to stealth Rock. While on the surface it may seem like it's not a huge deal, it really is when there are hazard setters out there that are capable of beating, or are paired up with mons that are capable of beating, common defoggers / spinners. SR Garchomp is an example as while it does lose to. Lati@s, they have to drop a Draco to kill him or risk being KOed by Dragon Claw / Outrage. Clef ales beats the Latis and has the staying power to come in multiple times and lay rocks should they be removed. Also add Ferrothorn and Heatran to that list, as while they /can/ lose to the Latis, they don't always lose. Additionally, Bisharp exists and AV sharp completely takes advantage of the Latis which makes defogging a liability against teams with sharp. It's the reason why sharp is run on many HO teams. Additionally, Talonflame relies on recoil moves to take out its opponents, so if it does come in on rocks, the amount of damage it can dish out is severely reduced.
I'm going to end this post by emphasizing something I said in my original post (which is unedited btw) where I said that Talon is still good. I know he's good, and I know he's threatening. I just said he's not
as good or
as threatening as before, and that i feel that A rank would be more appropriate. I honestly don't feel that Talon is on par with Gengar, Sableye, Lopunny, Keldeo, etc, and instead more on par with Zard Y, Garchomp, mega Diancie, and Excadrill. Additionally, Pinsir resides in A rank, and they more or less check most of the same things (keyword most; ik that they can take on different things). I still stand by the notion that Talonflame is A rank, while at best being the worst A+ rank.