Bear in mind that as of now, most of what I think is due to spectating people I know, trying to build, watching the tier as a whole and what I think of it, so playing currently is a bit limited, but here's the elements that give me large pause with regards to Talonflame, and why I don't think the unban posts are really doing a lot to convince me.
- RU's issues with fire types: There's no questions that well, a lot of them are definitely viable in the tier. Salazzle and Ninetales are the premier picks, arguably two of the most painful mons to address in the teambuilding phase. Houndoom and Marowak are a bit more niche, but stabs + surprisingly valid defensive value on top of high powered moves keep them going. Stuff like Arcanine and Emboar are more niche but they're not unusable and can create actual pains in a game if you think covering a fire with rock types actually makes you safe. Basically, picking a fire type in RU is a lot like, picking a good mon with vastly different attributes that can nail a good matchup depending on what you opponent prioritizes as counterplay. Which brings me to Talonflame... I personally see it in Salazzle / Ninetales' range. Too fast, too good as setting up, valid defensive utility on top of recovery, strong priority, good offensive typing. In fact, I tend to think of Salazzle as a sort of barometer of what this tier can handle. It's stupid fast, has enough defensive utility to typing to be played aggressively, has a ridiculously good offensive presence. Talonflame is faster, being beaten by only really Aero / Sceptile and scarfers as far as viable mons go, better defensively, has recovery, more diverse options at setting up, and the one thing it doesn't have over it - raw power - is offset to an extent by really strong stab moves.
- Oh, and priority I guess: I do think the 190 bp move is a bit bonkers if you add priority to it, especially if you manage to get it at +2. It just invalidates a lot of scarfers late game / forces them to lock in a specific move because if you predict badly and Talon roosts well frick. But priority being really really good and stupid and all these things doesn't mean that removing it from the argument invalidates Talonflame by itself, which a lot of the earlier posts seem to imply. As noted when I compared it to Salazzle, it's still faster and more defensively viable, which removes even more counterplay than our current crop of fires does. So, yes, priority is definitely a point that can tip the balance, but I definitely don't think it's the only one, and too much focus on it being preserved isn't necessarily the most optimal route in game, nor does it really debunk that it wouldn't be a good addition to the tier.
- Removal is.... good: I think the main point I was puzzled by in Pepeduce's post - which I don't think is bad by any means - is when he stated that Talonflame benefited from good removal back when it was in the tier. I'm sorry but... how? Gligar was the main remover at that time, but it was an Immunity-less Gligar at that time in SM RU, which meant it couldn't keep rocks off against the power duo of Regi/Bronzong, on top of losing to Nidoqueen which was probably the best non broken at the time. Donphan was considered bad for the most part, we didn't have Mandibuzz or Blastoise or the influx of niche defoggers brought to us by USUM... So no, if anything removal in general now is exceptional, and arguably as good as RU has had since I started playing it. Both Donphan and Blastoise are valuable spinners that have great synergy with Talonflame and are pretty hard to successfully block in this meta. Defoggers can be awkward sure but if you want one they're definitely viable. That's on top of just playing to a point where removing is also in your opponent's interest, which if they have a defogger can lead to difficult choices. And that's without the fact that a lot of uppers have a bad matchup vs Talonflame. Some might think that sacrificing 70 on your steel rocker is good to get them up but that's super bad to me lol, + if you face CB (good set btw) you just die. Pressure in the hazards game works both ways, in my opinion.
- Bar rock types, defensive counterplay is hardly reliable: Slowbro can get ohkoed by Talonflame's z-move if hazards are up, and it's generally considered the best of the best in terms of defensive counterplay that doesn't resist. On top of that, it doesn't ohko back. Mandibuzz can Foul Play I guess but also dies after rocks and if it's BU it tends to be setup fodder unless you still manage to fit Toxic and catch it by surprise. RegiFlorges are basically bait, others bulky waters have even less a chance. Talonflame basically forces in a rock type, which isn't that awful cause they can check other fires too - although, not all and not that well - but it's a little bit ridiculous to force that on teams when the rock typing in general is probably at its lowest, and I even say that as a fan of all of them basically, Diancie Aero Rhyperior and Gigalith are all pretty good but consistently fitting them in a tier where removal has never been this punishing to rock types can be a struggle.
So all in all, I am concerned lol, I don't think we've sorted through all of what Talonflame can do and all its attributes that are super stretching for the metagame as it is. It's ridiculously hard to check and it's malleable enough to stay on top of the meta, and I do think this one is super friendly to it. It's not super difficult to splash on teams because again it has so much versatility, it's definitely good enough to capitalize on so many staples and I don't know if saying the tier will change is necessarily enough, because so can Talon, and it definitely asks tough questions of this tier where both its typings are already incredible and simply adding another headache on top of the other good mons seems very risky to me.