I wasn't going to downvote you till this part.
Anyways, I disagree. But it really comes down to what you value in a story. You're not going to get the rich lore of Mordor, or even Tamriel in a 2 hour runtime. Movies excel at creating character moments, and any kind of worldbuilding that isn't built on an entire series will feel shallow. Or maybe boring because it will take the entire runtime and you have nothing to attach to.
Samurai jack feels like a great example. It could have been a focus oneshot on how Jack got back to the past and beat Aku. A great one, even. But that's not what the show is about. It's showing the long term effects of aku' reign, how society adapted around it, how the next generation receives propaganda to keep serving their tyrant, and the small bits of rebellion and hope shed among it. Jack getting back to the past to undo all that wasn't why Jack is thought of as a great hero. It's the influences he had and seeds of hope he sowed among the dystopia
(And yes, now Netflix owns that).