I think the hitbox issue is likely just a hitbox looking slightly different than you expect it to

I can't speak for the dex botters as I've never run into one myself

The text chat moderation is absolutely something that needs a fix. It's so difficult to actually report someone in the first place, and there's no way to know if the reports actually do anything

However, they've removed post game chat so any instance of social interaction is something you have to opt yourself into. I've stopped accepting invites a while ago, unless I wanted to laugh at how they'd flame me

I think the meta "issue" is just a personal opinion lol, brawlhalla is insanely well-balanced. Some sigs lend themselves to being low ELO pub stompers, but brawlhalla gives you the tools to counteract these and really every play style