Yeah, that's what I mean by the mid-catalog. People you didn't quite go intending to play, and not the headliners. To the degree that it's a fairness discussion though it always comes down to sorting into buckets (even if absolutely identical buckets) and arguing for some distribution.
Good point. That's the sort of thing that warms the cockles of my artist-supporting heart.
The nice thing about the proposal from the article is that in theory it should be something where everyone's incentives are aligned, since it rewards artists and genres for having fans who listen to their stuff a lot.