I usually defend streaming services but I actually think they are mostly responsible for this.

They could make it explicit when they sign the deal that it's a limited/mini series. But they don't because they want hits that they can do 8 seasons of.

Mini series are the way, give you more time than a movie to flesh out a plot, but also gives you a beginning, middle and end. But neither the creative nor business side wants it, actors and writers want the stable work, business wants 100 episodes of hit content, not 10.