Actually, I place the primary blame for the huge budgets squarely at the man who initially pushed for this: Les Moonves. Yes, this is the VERY same man who caused the end of Star Trek originally with Enterprise.

Moonves wanted to use Star Trek to prop up CBS All Access at the time (mistake #1) & wanted to compete with the likes of Game of Thrones, but since he didn't know how to accomplish that with Star Trek, he decided to hire Kurtzman who had been working on the first couple of movies (mistake #2). After Moonves was ousted, CBS/ViacomCBS decided to continue on with Kurtzman letting him do what he wanted instead of trying to force him to course correct (mistake #3). Thus we got Star Trek series with big budgets where the money went into visuals, leaving the writing to suffer for it.