Yeah, BP is really gimmicky and I don't believe it needs to be nerfed at all. There's entirely too many counterplay options, and even without the hard counters like Taunt, phazing, Haze, etc, smart players can read BP plays and punish accordingly. Moves like Taunt, Roar, and Haze aren't even obscure either, and you're actually in a worse off spot against most teams by not having some kind of check to set-up sweepers. BP is the same thing except they take one less turn, essentially. Plus, as many people have brought up, hazards ruin it.
Mienfoo, while very central to the metagame, isn't unhealthy either. It can fulfill a variety of roles very well, but it's not a Pokemon that's going to automatically win any games. Because this is a Fighting-dominant meta, the meta is geared around checking potential Fighting-type threats. As such, Mienfoo has a myriad of checks, and that's not solely because of Mienfoo, but because of other dominant Fighting-types as well, so Mienfoo isn't as centralizing as some people make it out to be. If Mienfoo were to go, Fighting-types in general would still be very powerful, and a new dominant Fighting Pokemon (most likely Timburr) would take its place, and not much would change. VoltTurn teams would adapt incredibly easily; that playstyle isn't going anywhere. The meta is fine where it is, and suspecting perfectly fine Pokemon to ruin it and cause more "innovation" (read: chaos) to happen is pretty silly. There's nothing really worth suspecting at all at this point.
Mienfoo, while very central to the metagame, isn't unhealthy either. It can fulfill a variety of roles very well, but it's not a Pokemon that's going to automatically win any games. Because this is a Fighting-dominant meta, the meta is geared around checking potential Fighting-type threats. As such, Mienfoo has a myriad of checks, and that's not solely because of Mienfoo, but because of other dominant Fighting-types as well, so Mienfoo isn't as centralizing as some people make it out to be. If Mienfoo were to go, Fighting-types in general would still be very powerful, and a new dominant Fighting Pokemon (most likely Timburr) would take its place, and not much would change. VoltTurn teams would adapt incredibly easily; that playstyle isn't going anywhere. The meta is fine where it is, and suspecting perfectly fine Pokemon to ruin it and cause more "innovation" (read: chaos) to happen is pretty silly. There's nothing really worth suspecting at all at this point.