Gary
Can be abrasive at times (no joke)
Gonna post some of my own personal thoughts as well as some brought up by esteemed OU alt maker LL in OU discord.
B+ to A-: Yeah I was one of the few people that was against this dropping on the VR council aside from Finch iirc. Mew usage is dropping quite a lot because people are starting to gravitate to other removers such as Kartana as well as standard Latios/Mega Sciz bullshit. A lot of the current balance running around use like defensive Lando or like Clef as their Medi switch-in both of which lose if they mispredict, the former can be 2HKOed by STAB into Ice Punch usually anyway. It hasn't been used much in snake but the few times it has it's definitely put in some good work. Mega Sab is also a lot less common with stall usage not being nearly as popular with Duggy ban. A lot of the VR council is against Medi but I've never really been sure of why myself I'm just the messenger boy. I just think it's super underrated and it's like really effective if played correctly but no one seems to want to bring it in Snake cause HJK is a bad move ig lol.
B+ to B: Disagree
C to C+: This mon is like lowkey nice as fuck. It's still not THAT great but it basically snacks all over standard CelePex balance with the Sub 3 attacks set, which has seen like 4 uses in Snake so far. Shuca, Groundium Z, Lefites, and Waterium Z are all cool options to run on that set to lure offensive Lando or like break through Clef/Mew better. Still faces a lot of competition and it is a weird mon but it's better than the shit in C imo.
Here are other noms LL brought up but I don't really have much to add on myself. Hera should def drop tho, just don't really see a reason to use it anymore when there are so many good breakers and Megas.
I don't really agree with anything you posted about Mega Zam. First off, Zam has been used recently in Snake. This match for example just proves that if you don't bring like a Steela or AV Gear (which is super easy to wear down) most bulkier just get completely boned by it. It shreds through all the Heatran/Clef/Venu/Pex/Ferro/Lando bullshit running around right now. In this match both players just lose to Mega Zam on team preview, because Skarmory is not a Zam check. Who cares if Scarfers can revenge kill Zam lol, like if anything the fact most teams have to depend on a Scarfer to revenge Zam is actually really good for it. Especially if your team lacks Steela like how are you supposed to really work around it outside of hoping Focus Blast misses which is what both of those teams are basically built around. You don't even need to use Zam on PsySpam so that's irrelevant whether or not that's used anymore. Like the meta is really favoring Zam if anything. People are getting complacent in team building as we have clearly been seeing with some of these snake matches. Trosko also brought Zone with Zam which heavily pressures any Steela team because most will be too scared to even go into it on Zam. Zam is nowhere near as bad as Zard-Y like lol what. "It's not fast enough to escape being revenged by most scarf users" I don't even know what this is supposed to mean lol. How fast does a Pokemon have to be.It's not fast enough to escape being revenged by most scarf users, not strong enough to break shit and is just honestly really not that good. I wouldn't call psyspam too great either. It's not really made very many appearances in tours for a good while now. B+ is too high.
Here are other noms LL brought up but I don't really have much to add on myself. Hera should def drop tho, just don't really see a reason to use it anymore when there are so many good breakers and Megas.
LL said:Hawlucha to B+: Hawlucha is broken and just busts through a ton of offensive and defensive teams alike, not even requiring all that much chip to destroy things like Toxapex and Tapu Koko. Pair this thing with hazard stack and it just wins games by itself.
Tapu Fini to B: Tapu Fini is an alright bulky water that can still fit onto teams in this meta, but it's honestly a good bit worse than Mantine and can't consistently check what it's supposed to because of its lack of reliable recovery. The recent rise in Sub Volcanion and Scizor aren't doing this thing any favors either. Tapu Fini is still a fine Pokemon, but it faces way too much competition in this metagame and doesn't like the metagame now and should be moved a rank below Mantine.
Mega Hera to B or B-: This thing is honestly super suboptimal as a breaker because of its shit speed tier combined with being really hard to fit on builds in general, not to mention it takes up a mega slot. If I want to use a wallbreaking mega I'd much rather use something like Maw, Medi, Zardx, etc. This thing has been on a backslide for quite a while now and has a pitiful winrate in tours along with just generally being a steaming pile of shit.
Bisharp to B-: Webs is dead and this thing is like never used anywhere else. It's still kinda threatening, but with all the fast offensive dark resists that are good rn (not to mention specs lele being a dickhead) along with the complete lack of setup opportunities this thing has makes it a subpar choice overall.