Artists are agents of invention who attempt to change the dominant conventions (although many individuals operating under the rubric of "artist" have much more pedestrian and commercial goals.)
1.9.1 The avant-garde exposes, devalues, and alters existing conventions in search of new cultural arrangements that could provide new aesthetic... See more
This study identifies 33 as the tipping point for sonic stagnation , an age where artistic taste calcifies, increasingly deviating from contemporary works. But wait, there's more. Spotify data indicates that parents stray from the mainstream at an accelerated rate compared to empty nesters—a sort of "parent tax" on one's cultural relevancy.
Glut is never cool. And to be entertained, humans need some form of novel or complex stimulus that goes beyond what they already know. And you can't just "tune the AI" to be innovative, since we only accept idiosyncratic artistic decisions when we feel human intention behind them.