The best parts of Fear Inoculum, Pnuema, Invincible and 7empest are all their endings, so I don't buy into your "not building to anything" point.
Personally I think the best bit of Pneuma is the huge riff is brought in early. It's the sort of crescendo Tool take minutes to build into but they do it nearly straight away and return to it a few times. That song is the best on the album by miles imo, one of my GOAT Tool songs already.