First of all, i'm not defending any version of fanbase/fandom in regards to my opinion below. Now...
It's true that both comic and manga have different styles, then again, it wholly depends on one's taste. A person may get used to manga for years, so he finds it a bit hard to accept a comic concept, and so likewise. In this case, lack of dialogue is not the main problem. The real point is how the story is written/drawn, is it good enough by telling the route of tale using only pictures? Or does it need more text than various different images? Or perhaps better off with both? Again, it depends on the mangaka/comic artist himself and his skill.
People like Death Note despite of the stack up texts because every word explained is necessary in the story. Some prefer less dialogue such as Natsume Yuujinchou or Flat because the image itself is self-explanatory; "1 picture is worth for 1000 words".
For me, Japanese people love to play with ironic matters and contradictory. They seem organised and mainstream on the outside, but actually they have some hidden messages they want others to hear & listen. Hence, manga is produced. Through manga, you guys realise there are numerous weird stories and genres, where they keep on questioning and bothering with humanity dilemmas, forbidden thoughts, out of norms actions, distortion of religions + philosophies and so on that generally a normal person wouldn't even ponder about it.
Now tell me, is there a comic that bravely touch such issue? I never heard any comic got banned in any country, but in case of manga, there was a few of them had been blocked in certain places. Naruto is good, tbh, it's just Kishi heavily implied a few humanism doubts towards the end of the series it becomes seinen+shounen. Idk why he seems rushing to finish it, but it's a pity that he doesn't highlight the unanswered facts he has been hinting on so far. Unless, he has done it in previous chapters, but the readers aren't well-aware of it.
I have realize the same thing as well. Most Japanese Manga are poorly written on the conceptual side. It seems that Japanese audience cannot process complex ideology, and mostly, they seems to be caught into mere rivalry other meaningless life factors. The worse is that these rivalry are not even conceptually justified and they end up always into a contest of power.
Maybe this can be trace back to their traditions where everything seems to be solved by the sword without really caring for justice, what is wrong and what is good. With no offense, it seems that Japanese audience have almost zero knowledge of good and bad, and always resort to primitive concept such as the strongest, the most handsome, etc. They cannot simply sustain a valuable argument, even in adult movies. It is always someone get killed, then goes for a mindless revenge.
IMO, not really. On the contrary, Japanese used to be one-goal minded society, where they put the element of pride as the utmost priority. They didn't tend to solve everything with a sword without taking account other considerations, the reason behind it was because of the pride they wanted to protect, in which could be both blind and clear at the same time.
They have the knowledge of things that being assumed as good and bad, then again, they inquire about it instead, like who are we to say that one is good or bad? It's just how people in the world define freedom and a person's right. Some opt to an option of restricting it to a particular level, while some pin on a belief that there shouldn't be no rule and no judging.
You have to get used to Japanese way on expressing something through their actions and facial expressions. They don't prefer dialogues to explain, and the audiences/readers need to have a wild guess or nail it by themselves when it comes to interpreting the gist of the story.
