Despite some things like "Pet Sounds" seemingly having been run into the ground in terms of archival releases, I'd still love to hear that stuff pulled apart more. Just hearing the songs with single-tracked instead of double-tracked lead vocals is really interesting. I'm not saying double tracking the leads was a bad idea, but there is a sense of immediacy and intimacy with those single tracked leads that is worth hearing as well.
I think that it's humanity that pulling mixes apart emphasized. The humanity of those people who put the music together as a production. Suddenly, you're just hearing a dude singing and not "a production."