We had two films showing me how Kirk and Spock become friends in an alternate
universe. I have no interest in that personally. I already know they became friends in the prime
universe. Also I have no interest in seeing them fight alternate bad guys they already fought in the prime universe.
For the people who actually make the shows, the continuity became a chain that hindered their storytelling.
I highly doubt that. I don't think there ever was a story they didn't do because there was some conflict with canon or continuity.
Enterprise got smashed, but that's their fault. Don't do a prequel and you don't have any continuity problems.