I guess most of the early unreleased stuff has already been leaked and on bootleg comps already, I think he wanted to bring more recent unreleased & polished material to the forefront, since he's doing it himself.

After watching the interview with him on Drink Champs, he said he might do a third "Lost Tapes" with all the guest features & collaboration joints.

https://tinyurl.com/y4ba6hog

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"We in here talking about later career Prince records
& your fool ass is cruising around in a time machine
trying to collect props for a couple of sociopathic degenerates" - s.blak