And if he did, why would I prefer using his prompt instead of mine?

"Write a gangster movie that I like", instead of "...a movie this other guy likes".

But because this is not the case, we appreciate Tarantino more than we appreciate gangster movies. It is about the process.

This is exactly the process happening in the music space with Suno. Go to their subreddit, they all talk about how they only listen to ‘their’ songs, for the exact reasons you list.

Its bleak out there.