"Netflix / Disney etc seem to have copped onto one idea that works and just release the same tv show / movie over and over again with a slight tweak as it brings the money in without any worries."
This is the golden age of streaming. There's more diversity in show types on Netflix alone than across all platforms (movies, tv, direct to video) in the 90s. Paramount is almost entirely devoted to new Star Trek properties and HBO Max releases a new movie every month. If you aren't seeing innovation in story-telling its because you are a Philistine.
This question has real "kids today" energy.