Exactly. There have been some great standalone movies about Batman, Superman and Wonder Woman, that didn't at all require that they exist in the same universe, and I'm completely fine with that. One thing DC has an advantage on, as mentioned elsewhere, is 'evergreen' stories that just consistently remain on top seller lists, and that seems tied to how these stories are *not* necessarily in-continuity or part of a coherent shared universe with a bunch of other titles. Someone sat down and wrote a rocking story about X, and it did not matter what Y and Z were doing.
I'm quite comfortable with that mindset for movies as well. Tell me a good story about this character. I don't need a bunch of connective tissue to other stuff that might just get in the way of this character's story. Maybe the story can later be backfit into a shared universe. Maybe it can't and it's part of a 'multiverse.' Whatever. Just focus what's on your plate.