For your average art, I can see that. But movies and TV shows take a lot more than just someone with a passion. You'd need some system to decide whose movie idea is worth pursuing, and you'd need a robust mechanism to get them a team to make it with. Capatalism has a lot of flaws, yes, but at least if you write a role for a specific actor, you can pay them to do it instead of just hoping they'll like it enough to sign on.

And yeah, we can have those systems under communism, but they don't come automatically, so it's not going to be instantly far better.