Well, because consuming art, reading poems, having code written for you that solves a problem, and listening to music is also fun. Recently I wanted a grand elegy to Britain written as the Empire started failing and set to music in a specific style. I had it playing in the background while fixing some issues with some software.
It truly was joyful to have this available to me. It didn’t have to have mass appeal or need me to pay the right artists the right amounts. I had it in moments.
It’s a wonderful world.
To me the image of a world where everyone does menial work while entertaining themselves with AI-generated "art" doesn't seem fun, it seems extremely depressing and dystopian. I guess we just have different values.