Simply put, stall is not a viable playstyle, and being able to beat it is not something rare and noteworthy. Its simply standard fare.
I have to disagree, at least until you provide solid arguments for this statement.
It seems to me, correct me if I'm wrong, that your arguments are all based on this false assumption:
This set is also very notable for being one of the only physical attackers in the game that not only can take on Avalugg, but loves facing it, as it is an opportunity for a free set up (baring the rare Roar Avalugg).
The thing is, there is no reason why Avalugg shouldn't use Roar. If it doesn't, it's simply because, as someone said, the level of skill in new metagames is always lower. People need to adapt.
Avalugg has one big selling point: it has such a good physical defense that no physical attacker is able to 2HKO it. Being able to 3HKO is already quite a feature (but not very useful since it has Recover).
Now, what is the most natural intuitive way to deal with this problem? Setting up. With enough stat boosts, you can overcome any obstacle.
A player using Avalugg
has to account for that, by giving Avalugg Roar. It makes absolutely no sense using Avalugg without Roar, because Avalugg's job is to wall physical attackers, and Avalugg can't do its job without Roar. It'd make just as much sense as using Blissey/Chansey without Softboiled.
Physical attackers don't work very well in this metagame, unless you have a plan to deal with Avalugg. Making statements about how good some Pokémon are under the assumption that "Avalugg with Roar is rare," is not relevant to any serious discussion.
Unresisted Normal STAB is awesome and all, but people seem to forget you don't need to resist an attack to wall it. Heck, Chansey/Blissey has been the prime special wall since the beginning of Pokémon and she has no special resistances to talk about.
In fact so far I've been using Tangrowth as a physical wall, because people are so hyped about unresisted Normal STAB, that I rarely face something with Earthquake. This might change eventually, but so far it's been one of my most useful Pokémon.
Which brings me to my next point: I don't see how Staraptor and Swellow can be considered any good. What physical wall are you hoping to take down with them exactly? Flying is a poor offensive type, since it isn't SE against anything remotely useful and it's resisted by both Grass and Bug. Defensely, Flying gives you immunity to most hazards, but that's it: you have to pay with a weakness to Bug, Grass, and Ground for that. Weakness to Grass is especially bad, because if you don't kill, the opponent is just going to recover the damage you dealt with Giga Drain/Horn Leech.
Which again brings me to my next point. I'm very glad to see that this metagame is getting supported by Smogon, but I wish the people in charge with the banlists were a little more serious in doing their job.
When Deoxys and Blaziken were banned from standard OU, the players were given good motivations. You could definitely see that some thought had been put in those bans.
In this topic, on the other hand, I've read things like "Ho-Oh has to be banned because it resists SR and has Regenerator," and "Yveltal isn't to be banned because its typing is now bad, no matter that it has Uber-level stats."
I'm sorry, but these are not serious arguments. Ho-Oh now takes almost no damage from SR, great, but that's a very narrow analysis. No one mentioned, for example, that Fire/Flying sucks as a typing, both offensively and defensively. How are we not banning Yveltal because it's got apparently such an atrocious typing, and yet Ho-Oh, which is x4 weak to Grass, x4 weak to Bug, and has both its STAB resisted by those same types, strikes so much fear?
Now, please bear in mind, I'm not saying Ho-Oh shouldn't be Uber. Its STAB aren't that great, but its movepool is very good, it can cover that. What I'm saying is that it makes no sense giving it (and no one else bar Arceus) this special treatment, this quickban, on the simple ground that it's not weak to SR anymore.
And it especially doesn't make sense when we compare Ho-Oh's situation with Yveltal's. Why is Yveltal's typing suddenly considered bad? It's got the same Flying typing as Ho-Oh. The difference is that Yveltal's other type (Dark as opposed to Fire) is actually
good instead of bad in this metagame.
Is it because of their abilities? Thanks to Dark Aura, Yveltal has got the strongest priority move in the whole metagame: Dark Aura-boosted STAB Sucker Punch. Dark Aura also gives it the ability to go mixed: invest everything in Attack and nail physical walls with Dark Aura-boosted STAB Dark Pulses (or vice versa).
Again, what is the reason Yveltal is considered worse compared to the standard metagame? What does it lose? Is it because of the Grass weakness? Even assuming the Grass attacker can survive a Sucker Punch, Yveltal has got 126 / 95 / 98 defensive stats and Roost.