I think you make a very good point - which is that in the bigger picture, music is inherently evolutionary in a way that generative music isn't.

Having some experience with generative apps, I know that they absolutely do not make music spontaneously. You have to invent them, build them, and tune them - all by hand/ear.

It's more like building an instrument - i.e. a machine - and tuning/debugging it than cultivating a garden.

Music as a whole is much more free. When it's loose in a culture, it can evolve in weird, unexpected directions that no individual composer would ever be able to imagine, and no app today would come close to copying.