Everyone sees it the first time, but they tarnish the brand. Game of Thrones is the obvious example, but look at Star Wars. No one is clamoring to see the next Star Wars movie. If your outlook is the next 3 years, sure, bad writing will have a good opening day, but only because you're leeching off the corpse of the previous good releases. If your outlook is to preserve the brand, it's a terminal viewpoint.

You can take bad writing and even if it bombs in America, you can throw it at China and they'll eat it up because they don't know any better. But once a brand is dead, it's dead. China is not coming up with new plot lines. Hollywood and streaming studios are strip-mining the IP of the past because there's an industrywide lack of writing talent, for reasons that I'm too far removed to understand.