Kind of a shower thought, and maybe it’s just how I run campaigns, but it feels like there’s a lot of parallels between DMing and that guy who has a great idea for a book/movie but will never write a single page.
The DM comes up with “So what if there’s this guy with this magic power, and the only way to beat him is through a very specific process.” And then all the Players decide: who are the characters? What do they do? What do they say? How’s it all work out?
I write and I very quickly figured out that my stories are not D&D compatible. The stuff I write for my players comes from an entirely different canon. It also makes it easier to collaborate when I don’t feel like there’s a specific way things are supposed to go.