Because I care about art being a human endeavor. AI doesn't create art, it regurgitates an unidentifiable goop churned together in its stomach by all the crap its eaten. There is no thought. There is no feeling. There is no meaning. If you only care about the sound, that's cool, enjoy it, but I don't.
When a human makes a I IV V it's art
When a machine does it, soulless
It is debatable what thoughts and feelings went into the music of Wesley Willis, of "Whip The Llama's Ass" fame, despite him being human.