Chaosmancer
Legend
~looks at the last ten years except Tasha's. Looks at One D&D after the first playtest~
Well, I guess they're still doing a decent job editing. You got me there.
Fizban's Dragonborn options and dragon statblocks
Multiverse of Monsters Racial options and monster design
Xanathar's subclasses
Was there a deluge of material that was constantly pushing the bounds? No. But let's not pretend that WoTC has done NOTHING except Tasha's.
Also, looking at the One DnD playtest, they've done quite a bit. Not all of it is flashy, not all of it is good, but it is looking at the various options, not just stagnating.