I think that might be due to a change in the predominant TV format. In the Star Trek era most flagship shows were shot in the planet/crime/monster-of-the-week f

I think that might be due to a change in the predominant TV format. In the Star Trek era most flagship shows were shot in the planet/crime/monster-of-the-week format which would get better as the actors developed chemistry, their characters were fleshed out, and writers figure out what works best in the show. Nowadays, the flagship shows are either based on extensive literary works like Game of Thrones and Expanse which depend on the consistency of the writing and how easy it is to adapt, or they're concept shows like Altered Carbon that barely have an idea about what they're going to do with a full eight hour season when they shoot the pilot, let alone what to do for season two. The latter tend to work out really badly if they can't hang on to their writing staff See for example the 2011-2016 show Person of Interest that went from a mediocre if interest crime-of-the-week to possibly one of the best serialized science fiction TV shows about two AIs fighting it out (I'm rewatching it now due to the relevance)