If I had to guess, three related factors:

1. Platforms like Suno lack the granular control that can make a song distinctive and interesting. A prompt is an all-or nothing paradigm. There is no gradual build towards a final result like in normal creative processes. Yes you can supply lyrics but that’s hardly a substitute. And on top of that it’s painfully slow due to the nature of the technology.

2. As a result of 1, experienced music producers (familiar with regular DAWs) don’t want to use it. They probably prefer something with instant feedback. Tweak a synth param, you can instantly hear its effect. And changing one instrument doesn’t randomly affect unrelated things.

3. As a result of 2, the majority of AI generated music is throwaway and or created by amateurs who don’t have the ear for what makes a song good.

I have a background in painting but this is 100% the same problem in that domain. Without the ability to make precise isolated changes it's not very useful. I expect most creative software to integrate gen AI eventually, but it needs to be in a way that gives you a lot of precision

I think that you're probably right here - it's the granularity. We'll probably see that improving as things move along and hopefully get something interesting out of it at some point. Quite frankly the alternative is too depressing to think about.