[UserNameGoesHere]

The solution is to leave things as-is. There is no problem as-is. The only "problem" I see is people who maybe didn't do as well as they'd like on Legacy files wanting to inflate their stats. Go practice those files then if they're such a problem, or just don't worry about it.

I mean do we need to have a separate stat bar for every genre? Do we need a separate stat bar for every engine? For every difficulty level? For every kind of chart?

Just leave it be. Simple.