I do think for some fans, especially those who hated the Abrams films, it’s assumed that Kurtzman is the mastermind behind all these shows thus he makes an easy target for them. Rich Evans kept bringing him up over and over on RLM as if everything done on DISCO and PIC was all his idea. The thing is that Kurtzman is not only credited as an executive producer on Trek but also multiple shows outside of it because they’re all under his production company. My assumption is that he’s way too busy to have that kind of hand in the shows which is exactly why there have been assigned show runners like Chabon, but you’ll never hear their names brought up by those disgruntled like Rich Evans.