Elitism is necessary because when you allow idiots who only read (More accurately watch) a series for one character and said character doesn't appear anymore, they lose interest in the series but still keep lingering in the fandom posting irrelevant shit and cluttering up meaningful discussion with "X IS CUTE I WANNA HUG Y".>What part got so dumbed down according to your imagination?
Everything. Everything was spoonfed to the audience, sometimes twice in one episode (Hisoka/Kastro), and by CA they were stretching things out horribly. And even when the information is spoonfed to the audience, somehow these idiots starting from 340 failed to pay attention and still ask stupid fucking questions and then with jumping from a vocal work to a visual work, they hate all the WORDSWORDSWORDS (Blame Mangastream) and shitpost because Gon is the MC why is he not present, going back to the first point I made about characters and their awful fans. Add on to that, if there's no action they really hate it due to more WORDSWORDSWORDS.
tl;dr Elitism is necessary to keep a fandom from going to shit.