I'm not against AI music. From my point of view, perception is everything, and it's all relative to one's point of view. I do understand, though, that for some people, the whole point is to gain a real understanding and connection to another real human's feelings and insight. I can't really fault somebody for considering art to be about more than the end result, and feeling that it's empty without the process.
Also, I do feel at my core that creation is superior to consumption, so even though I'm not bothered by AI output (even as a musician and an artist), I have a feeling of respect and admiration for those who create that I simply do not feel for people who type a request into a prompt. Effort and work for a goal are respectable.
The ends do not always justify the means, and even if the end result is identical, there is a greater implication on what it means to be an artist, and possibly many negative (and positive) externalities as a result of being able to get the same results with little effort. The art is identical, but the effect on humans is not necessarily. We are changed by the journey, both the artist and consumer. The actual effects of short circuiting the journey isn't something we can fully appreciate until we've had generations of humans who have lived with this. It might be a good thing, but it's not guaranteed that it won't be potentially more negative than positive in the long run. I'm optimistic, but I think it's foolish to not be cautious and skeptical about potential side effects.