Fair enough.
Not saying Hamada's plan would have necessarily led to great films, or even good ones. Just saying that it was a valid approach.
I mean, I dunno...if being part of a shared universe isn't working, and not being part of a shared universe won't work, then I dunno what will. Maybe WB should just shut down DC Films? (Lord knows they're shutting down a lot of stuff these days...)
I don't think any of those films failed because they weren't building up to a Justice League movie of some sort. But you're right that DC/WB did kneecap themselves with the obstinate refusal to have more of Cavill's Superman in the films. If nothing else, at least having Superman in the films would have got butts on the seats (a post-credit scene in Black Adam alone didn't cut it, evidently).