So this kind of music has a name, it’s called production music and it’s been long expected in the industry that AI-generated music will compete with the lower-end production music, basically elevator music or background music for corporate training videos etc. It is unlikely, however, that it will get much traction in scripted long form productions, partly because studios believe it’s a legal minefield, and partly due to resistance from creatives (whether justified or not).
so none of the reasons are quality. purely cope and risk lol
For what it's worth, I support manned spaceflight. But sometimes allowing "creatives" to impede progress has its costs.