I never got around to checking them out, but Smogon's June stats give some insight as to what's changed now that Landorus-I is gone from OU. And... this is totally the opposite of how I expected things to go. Weavile was stated to be the worst thing a Landorus-I could face, and yet instead of falling off the face of the earth, it climbed from #39 to #21 in one month! The only idea I have is that Garchomp and Landorus-T, the top two Pokémon on the ladder (presumably replacing quite a bit of Landorus-Is on teams) are so common that non-STAB Ice moves just don't cut it anymore. Remember how we were saying a few months ago, when Mamoswine dropped to UU, that OU was so devoid of Ice-types it was getting stupid? Well there's our answer, Weavile is just more adapted to today's metagame than Mamoswine. Kyurem-B is also on the rise this month, for what it's worth.
Don't look, but Hippowdon is actually CATCHING UP TO TYRANITAR. The difference between the two went down from 3.5% to 1.3% in just one month. We might be living in a world where Tyranitar is no longer the best Sandstreamer very soon. Holy shit I can't believe I'm typing this. Speaking of defensive titans, Chansey's stock is also down (#39 down from #31), and if the trend keeps up it might struggle to remain in OU by the end of the year. On the other hand, Manaphy was #35 last month, and is actually rounding out the top 20 now! Never underestimate Tail Glow... this guy might actually have been a gamebreaker had it been a bit faster.
On another subject, Smogon added yet another restriction to Baton Pass use, since it turns out even restricting it to one user wasn't enough to curb its gamebreaking tendencies. And trust me, this is the most stupidly elaborate restriction I've ever seen from Smogon. Get a load of this: you are allowed to use only one Baton Pass user, but you can't use it to pass speed and something else at the same time. The most immediate consequence is that you can't pass Shell Smash or Geomancy anymore. (Funny timing, since Serebii's latest PotWs were Huntail and Gorebyss. I swear I'm going to die of laughter if Smeargle is next.) You also can't use Scolipede to pass Speed Boosts and Iron Defense/Swords Dance at the same time. (And to be honest, I wonder how much this new development would hinder Blaziken if it was allowed.)
Yeah, that's ridiculously convoluted. Personally, I think that if they had to do something, banning Baton Pass altogether would've been a better avenue. I mean, it's hard to justify using it at all if you can't pass boosts on the most important stat, right? Now I know what you're thinking, namely how I said a straight ban on Swagger was stupid... however, the key difference between that and the Swagger ban is that a combo ban on Swagger and Foul Play would've been a lot more straightforward than this overcomplicated mess. I should also clarify, this new ban doesn't restrict teambuilding at all, it just makes Baton Pass unavailable in the middle of battle if you have boosts in both speed and another stat.
Furthermore, still on the subject of Baton Pass, they're also reviewing its use as far as past generations go. Those metagames have evolved recently in such a way that restrictions need to be applied now that weren't necessary back then for whatever reason. Since I don't play past gens anymore, I can't say anything for sure about it, especially not the answer to the question "why is BP causing easy wins now but not back then?", but maybe someone can enlighten me.