Supposedly Gilmour thought they should've recorded these and Shine On You Crazy Diamond and had that be their new album after Dark Side. Probably for the best they didn't try to stick two mega-eps on the same album.
Something else I was thinking about the early stuff, there's a weird lack of a clear trajectory from album to album. If someone heard them all blind I bet they'd really struggle to figure out what order they were released in. Part of that's probably because of all the soundtrack projects, but even so.
I was also amused to discover the director of the two films their soundtrack albums were scoring was the Barfly guy who went on to direct Single White Female.