Sarang: Or the ones who are talented can't get hired for one reason or another.
Europe and Asia largely always had better TV shows because they were one or two seasons and that was it. I largely cringe when KDrama's do a second season unless it is fake and Netflix is calling it a second season.
Mafwek: That may just be the case of grass being greener on the other side.
I don't think talent is the thing lacking in modern entertainment these days, it's skill and passion which is needed.
Naw having an open plot arc is pulling story out of your ass. That means it is more likely to be trash, I would say the same of any show creator outside of the US, Hollywood was just STUPID enough to overly rely on Golden Gooses for their prime time ratings. Maybe I should say unicorns. The semi-antidote to these were mini-series but they stopped doing them in the late 2000's or early 2010's. They may have cost more than expected but did have a reliable closed plot arc.
The only open plot arc shows are pseudo, like medical diagnosis and so on. Look at the older Hollywood classics like Twilight Zone and Outer Limits. Those had many seasons but all were self-contained "hour" shows and the medical diagnosis ones were mysteries solved within' an hour too. "House", "Burn Notice" and "Monk" all had that vibe.