Why doesn't a normal cat talk in manga?

Well, there could be various reasons. Maybe the writer wants to create a unique situation where Naruto is silent to add mystery. For example, if the fanfiction is set in a scenario where Naruto has lost his voice due to a curse or some kind of magic. It could also be that the author is focusing on other characters' reactions to Naruto's silence, which can bring out different aspects of their personalities.

Could be that the characters aren't relatable or the themes don't appeal to your interests. Sometimes it's just a matter of personal preference and not a reflection on the quality of the manga itself.

Maybe he's having a bad day or is preoccupied with his own problems. That could be why he's not responding positively to your stories.

Maybe he's just a bit shy or doesn't know how to express himself verbally. But he enjoys your stories because they intrigue him.

Maybe there's a glitch in the system or a software bug causing the filter to malfunction.

Maybe it's a technical glitch or server issue. That could be causing the loading problem.

Mainly, hentai manga doesn't count as mainstream because its themes and imagery are too adult-oriented. It doesn't align with the general preferences and values of a wide audience. Also, it may face censorship and distribution limitations.

One reason could be that coloring manga pages is very time-consuming and expensive for publishers.

Maybe it's due to a less engaging plot or unappealing characters. Not every manga can hit the mark for everyone.

Maybe it's the art style. Some people just don't click with it and that can make them not enjoy the manga.