That’s not really the point though.
While Slow Horses, Reached or Silo had their print audiences, they are not adapted solely because they are reaching enormous audiences as books. They have become successful shows because someone made the case for adaptation to the studios.
Star Trek has been struggling to make serialized live action shows successfully. Why not go with what works and adapt that?
Directors, actors and art directors seem to be very happy to tread the ground of adaptations.
What we really have is some writers that want to tell their own Star Trek stories but aren’t doing a good job of serialization and studio executives who think that rehashing existing stories and characters will buy success.
And yes we have egos like Patrick Stewart’s holding his character hostage to his own reinterpretation of his character to be a reflection of himself.
But as we have seen with the character of Jim Kirk, there can be other actors to carry on the legacy.