Why are there fewer and fewer good TV dramas, Zhihu?

Mainly the plot. Nowadays, screenwriters don't pay much attention to the feeling of writing a plot. Nowadays, it is popular to adapt online novels or games, but the adaptation is far from the original plot, which is very disappointing. And some novels are very popular now, but not all of them are suitable for adaptation. But now all the investments are adapted novels, which makes me feel bad, and the TV censorship is strict. Many plots can only be adapted, but they can't come back in the end, so they are often very tired.