With music this is much more pronounced because most people are musically illiterate, so even the basic mistakes while dragging characteristics over diffs becomes invisible. It's an interesting phenomenon I agree, but it says more about lack of taste and illiteracy of the common individual.
But on the point of "thinking hard", with music and artistic production in general, individuals (human with soul, not npc) crave for ideas and perspective. It is the play, the relationship between ideas that are hard to vocalize and describe but can be provocative. Because we cannot describe or understand, we have no choice other than provoke into another a similar contemplation.
But make no mistake, nobody is enjoying llm slop. They have fantasies that now they can produce something of value, or delegate this production. If this becomes true, instantly they lose and everyone goes directly to the source.
Art is specifically about communicating the inconceivable, cannot be delegated. If the tool is sufficient to produce art, then the expression is of the tool itself, now they ARE.