Plenty of people do.
They just don't have 'Star Trek' written on the cover.
I don't care for most Star Wars novels.
Honor Harrington stuff is good but it isn't Star Trek.
Battletech jumped the shark years ago.
Write your own, perhaps? Create a coherent universe and tell stories within it that fit the parameters you want to read...
There is the saying:
"Happiness is great food,
cooked by someone else"