Another reason why such utterly cheap production habits have been wildly accepted is because of the already established history of house music and techno, which was originally revolutionary, because those sounds and the contexts for which they were experienced ironically represented newfound human feelings of liberation, from a youth movement to escape a bankrupt Detroit to the fallen Berlin wall. Techno was a way for people to grab the rising technocracy by the horns so to speak and make something specifically human out of it.
Anyway, my point is: even music with "repetitive structural patterns overlaid on similar timbres" cannot be replicated with any genuineness by computers. Not yet, and probably not for a very long time. We, as people, can sense the insincerity. Now, if the goal is literally to have repetitive background noise with no real melody or structure then sure we can certainly already do that. But I also would not call that music in the true sense of the word.
The minute we realise music isn't the authentic voice of another human being we reject it.
Even my enjoyment of arguably mechanical music like some of the early minimalist stuff - where to a degree processes determine the structure and unfolding of the work - is mediated through my awareness of the authorial intent of the composer. (I'm talking more about Piano Phase than Pendulum Music here - the latter is slightly too devoid of human intervention to be 'real music' for me)
How would you feel about a novel generator? Why is that so different?