DS9 is a good litmus test for determining what kind of Star Trek fan you are. It broke a lot of the optimism and continuum of how Star Trek had worked previously, where hyper-competent people just always seem to come out okay. It smashed reality into the faces of sci-fi fans by building an actual war-narrative into the character arc (an episode of DS9 deals with GWOT PTSD better than almost any other network TV show did) and so it's not really surprising that DS9 was a little controversial when it aired. I stopped watching Discovery after "the burn" event because it didn't make any sense, and it was obvious the writers wanted to start from scratch. Space fungus powers the ship? A character has a panic attack and any ship with a warp drive is blown up? Not a serious sci-fi show and one of the worst entries into the Star Trek catalog. I hope Paramount takes a pause and we don't get any new Star Trek for 5 years, so the writers can grow up.