I think the Miles Davis multi-CD box sets that Columbia put out are beautiful, with incredible liner notes and are a good model for future Prince vault releases.

Some CD's may have multiple takes of the same song across various time periods that allow you to see how the song evolved over various takes. The market for this kind of release is much more limited, but it is the only example I can think of that presents the music as it was recorded and allows the listener to make their judgements about why it was or wasn't released..

I have most of these and some songs are even partial songs that Miles abruptly ends because he didn't like the way a note was played.

Sure if there are complete albums ready to be finished, release them as he planned, but if the goal (which I think it should be) is to share as much of his recording genius of Prince with the rest of the world, then having them properly curated, compiled and released under a specific theme or time period is the best way for this stuff to come out.

All the Columbia recordings were available in a single box set much later in a limited edition trumped case:

https://www.milesdavis.com/news/the-genius-of-miles-davis-a-must-for-miles-davis-aficionados/