The problem is that if the 5 SFX tracks get released, they will take up 5 slots of soundtrack tracklist, and something tells me they are not the only ones. I would prefer a single track with changes like "days gone by" from FZ, fitting the scene, than these. It would be more interesting to listen to and would be only 1.
But i guess what happened was that the director said to Yuki "create this and this and this sort of track" but didnt said anything about scene-specific music, so he used 5 of the random SFX Yuki made.