Fans blamed him for everything they didn't like about the shows he was EP for. Maybe that was justified (I honestly don't have an opinion), but also maybe him being just a tiny less "progressive" than everyone else kept Trek from going too far off the rails.

In a similar way that perhaps Harvey Weinstein only putting women he was attracted to on the casting couch ensured Hollywood starlets were pulled from a pool of attractive women instead of...whatever they are now.