Agreed very much on Reich and feel very similar about Brian Eno’s solo work. What’s the difference between aleatoric music and generative music?
Relatedly, Omri Coen has an interesting video showing his creative process while creating generative music using VCV Rack:
For example: Music for Airports is built from very long tape loops with different durations. It's completely deterministic, but the results sound like a random-ish stream of constantly changing note patterns.
It only works because no human has a long enough memory to hear the loops as loops. If our short term memories could hold a long loop as a percept we'd have a very different and less interesting listening experience.