I feel like these abilities are very much related to them being conservative about what they give each mon lol. Vibes are telling me they will be changed in future balance patches.
So far from what I've played the game feels pretty good. I mostly just transferred my mons from other games, but building them wasn't too bad. It also helps that the ladder is not too competitive either in the lower ranks so you can get VP pretty fast. That said, buying mega stones + other items eats into that pretty fast. I also just got the day one box space thingy which is pretty nice for all the mons one would want to transfer in.
Initial impressions tell me that corv is pretty good in the BSS format esp vs the rental teams lol.
From what I've been seeing most of the shit you'd be running anyways like Corv, Garchomp, Dragapult, etc. seem PRETTY good in this format. Mega Clefable has been pretty great in the lower ranks.