The volume of output for them ruins the specialness of the movie and story.
Some grew up with Star Wars being 3 movies and a couple of arcade games. It was more special before they ruined it.
Despite what our corporate overlords want us to think, it is possible to be a fan of a series and not like every entry and every piece of merchandise.
For example, say someone liked Snow White. Is it reasonable to say that they could be overwhelmed if 10 Snow White TV shows and 5 new Snow White movies were announced?
Is it reasonable to say you can like Snow White without wanting to know the detailed backstory of each and every character in the movie?
When did Star Wars go from a trilogy to an encyclopedia?
There is a saying people forget which is "too much of a good thing is a bad thing".