You just wrote an entire essay about how this isn't shit tier writing by using relativism (someone's trash is another's treasure) and claiming that the Japanese are somehow more accepting and less judgmental than westerners when it comes to stories (pro tip: they aren't. Just look at social media and how they attack creators just as much).
Unfortunately I don't have enough time to spend 15 minutes writing a dissertation on why Okamoto's writing is bad and how he derailed the entire story, which until a couple volumes ago was passable as a really entertaining fantasy + dystopia mix.
Social media is as one-sided and toxic as it is anywhere else in the world. However, search further and you'll notice that social media posts are still softer than in the west, and message boards, which are still a thing, are places for civil discussion Rabble-rousers exist, as they do in any society , but are far more controversial.
Have you actually lived in Japan? Talked with Japanese people? Worked with them? Shared with their hobbies? I have.
This is really the problem. Most people have a very warped idea of what japanese culture actually is like, because their only exposure to it is attention grabbing news or online posts. People think it's intolerant, and it is, in a way. It's intolerant of intolerance. It's intolerant of people who don't know how to respect others, their lives and their most especially, their work.
Please don't claim to me that the Japanese are more judgemental than westerners. Not when the latter regularly engage in culture wars among themselves, impose their views on everyone else including those of other beliefs or cultures, and so on.
Have you ever heard of a Japanese insisting their culture, their values are better to foreigners? I might be doing that now, but what about them? Have you ever seen them make news articles, columns, reports, manifestos or the like about issues in other countries? The west often seems very interested in doing that the other way around.
People know that japanese culture prizes conformity. You just have no clue what that "conformity" really is like, which is based on mutual and institutional respect.
I'm not going to argue as to why this manga is entertaining either. But at least I have a different reason than your judgemental position. If you like it, then you don't need it explained. If you don't like it, there's thousands of other manga on this site. And the responsible thing (as a properly adjusted Japanese would do, not a toxic little shit otaku living in his mother's basement which are the Jps you're thinking of) would be to drop it, and not stick around seemingly with the sole purpose of imposing your perspective that everyone should think this is shit...especially when you seemingly can't make the effort to even explain why. After all, everyone should simply accept or know what you know, and if they think otherwise, they should simply be dismissed, hm?
Oh and you can say it's relativism if you want. It doesn't change the fact that while western comics become ever more so formulaic, IP-bound, politically correct and focus-grouped, and many at least attempting to conform to the ideals of "good" prose, it's a shrinking and increasingly creatively bankrupt industry. And it's being steamrolled worldwide by the sheer diversity and boldness of Japanese manga. There's a reason most other countries, except notably certain other asian countries, struggle to capture that same spark when they try to create their own "manga". It seems that in the real world, "relativism" works pretty well for the medium.
Hope you enjoyed the 2nd essay. You might disdain the wall of text, but to me it's called giving fair consideration to the topic.