Lol I can't speak for all the wario mains, but I certainly won't get floppy over what you say. I've heard numerous people complain about side b, and to be fair, it's a pretty ridiculous move. I'm not going to bash you though, I can see the argument of adjusting some of it's attributes. I think the most reasonable thing you could do to it would be making it to where the second hitbox increase is the last one, instead of another size increase. Reason being is that due to the fact he's running forward, interpolation being a thing, and the move's final size increase, he can actually catch spot dodges behind him, not like super far behind him but it's still pretty crazy. It's just deceptively disjointed for how damaging it is and what you can do with it, so a size decrease is probably the most reasonable adjustment.
As for dair, I'll have to respectively disagree with you. Not that I'm saying you're wrong or anything, but I've never felt cheesy in it's usege, regular landing lag, l canceled lag and just the move in general seem fine to me. Though I wouldn't dismiss looking at it if it starts becoming a problem in the meta, but currently wario isn't viewed as a problem, so time well tell.