Someone tell me if I'm crazy, but I've had a thought floating around my head the past couple of days:
"Fighting Bayonetta has made Smash 4 players better in general."
Looking at Samsora defeat top Meta Knights, once thought to be a horrific matchup (and still definitely not in Peach's favor by any means), I had to wonder what changed. Some things are that Samsora is better as a player, and that Peach's strong float-based neutral can fend off the linear mixup approach of MK. However, MK still has a kind of touch of death vs. floaties, so it's still a tall order.
But then I thought about how Bayo can touch-of-death a lot of characters, and as she becomes increasingly common in brackets it's become the responsibility of top players to know how to deal with her. What I'm considering is the notion that everyone having to fight Bayonetta, with her plethora of SCARY tools, has just made people better at neutral and just straight up steering clear of those danger scenarios. This, in turn, potentially translates to people being overall better at matchups where similar risks exist, like Peach vs. MK.
It might be sort of like Melee, where Fox is definitely the best character, but everyone knows how to fight Fox because he's so common.