Geez, I really wish they had just held off on the Plus soundtrack and combined it with the Intergrade soundtrack instead. Together it would've been 7 discs, just like the main soundtrack.
Bigger picture though, I'm starting to see how CDs just aren't adequate for gaming soundtracks anymore. Not only is the sheer number of tracks increasing, but some tracks are dynamic so there might be multiple versions of it. Plus, in order to fit as many tracks as possible onto a single CD, a track might get it's length reduced. So maybe it only loops once when two loops would've listened better. It's like we need a new audio storage format.
I'm all for blu-ray soundtracks that allow you to export high quality MP3s of the songs, like the recent FF Revival soundtracks. The expanded storage would allow for tracks to be as long or as numerous as required.