I personally don't think you're wrong, but I also feel like Hollywood execs are no longer interested in the type of stories that make good movies. Movies are tight, self contained stories delivered in a couple of hours. Most of the good ones (Critically acclaimed) don't get that many sequels. Those are infinite cash cows, which is what execs prefer.

Premium series are infinitely expandable and are readily able to adapt larger narrative works. They're potentially endless wells of money. Seems like the industry wants to move in that direction.