Yeah I agree with that, especially because it allows for different leaderboards for each difficulty, adding that they have to be done in one sweep means that it's going to be a while before we see people perfecting them all first time, especially on higher difficulties as you say.

For what it's worth, I came looking for this game because I'm interested in running all non-DLC songs back to back, I think in a game like this it's much easier to do that than to include VN sections and the like, especially because it might require forcing NG saves to do story related runs.