I think a good amount of Simpsons hate is nostalgia based, but the primary component is the writers. the writing of episodes like a fathers watch follows an almost Seinfeld-like formula. the best episodes always had a similar pattern.the pattern is great but gets repetitive and works best on nostalgia where you don't remember it
i can sympathize with a show on for 30 years wanting to switch up that formula even if it is less successful all the time.