It should not run in multiplayer. Even if we wanted to allow touch-only
playlist items at some point, the current behaviour of multiplayer song
selects with respect to touch device mod is currently just broken.
This was originally set high because of performance concerns. We have
since improved things quite drastically. Even with a very low debounce
my song select is amazingly smooth.
This is about as low as we can got unless we want chaos when key
repeating left/right arrows (it's not as bad as you think, maybe worth
testing during review and see if it feels more expected?).
Of note, stable has key repeat disabled on left/right arrows and zero
debounce.
Addresses concerns in https://github.com/ppy/osu/discussions/24916.
Reproduction steps:
1. Go to song select
2. Open beatmap listing
3. Import a beatmap that would fit the current filter criteria
4. The count of visible beatmaps does not change
Fixed by updating the count on `BeatmapSetsChanged` too.