your average animefag is so jap worshiping they would glorify anything they do just to consoom more jap shit no matter how shit it has become over the years, they got settled into a certain style and way of drawing shit and the tropes stuck hard, the rest is just pouring fanservice down the endlessly ravenous fanboys throats and they'll eat it to the last drop
the turning point was when even the animes with good plots started to use convenient nudity to pander to their expected audience, then came the filler shit and pantsu shots and the protagonist's propped up love interest falling on his face etc
now days the only thing that separates anime from hentai is the age restriction and type of censorship they use