Honestly, it's people's preferences. we all know hentai , Yuri , yaoi , must have a sex scenes in it. And it's obvious that people who'd read it expect the sex scenes to be there ?? It's just like you saying that porn sucks because it has sex scenes in it, i mean it's called porn because it has sex scenes in it . If it doesn't contain sex scen......
In every Chinese story the evil characters are always like "I am going to end you" or "I am super big cultivator with maximum power, you can't defeat me!" then they procced to get their ass kicked Or when the mc is a female and she is talking to someone the antagonist likes and they're like "That sl*t! How dare she seduce my future husband." Like......
Yoai sucks