This is an oft-discussed topic here; search the forums to find other threads.
I agree it’s a bit goofy for every song using a sample-based piano xrni to hold it’s own copy of the flac files. OTOH it makes it stupid easy to share xrns files (e.g, when I work on different machines).
BTW, pretty sure people on macs or those using *nix often see value in migrating to larger drives. : )
Whether or not the system allows for such expansion is another matter.