Sorry but you keep say that BS, will not change anything as that's all you keep saying kid, preteen and adult gets very, very old and very fast. I mean my go there are a kitten tone of others out there that do far better then what Naruto did, the point of a story is to learn from something to be a better person as you grow up which other kids stories have done far better.
charlie and the chocolate factory: what does it teach us to be a good person, what happens to the four other good they get what was coming to them.
Lord of the Rings: Saruman what happened to him he died and was a traitor and he died for it.
JK even said it in an interveiw when making Harry potter books again for kids and she said hates traitors which she did in the 5th book some back stabbed them and the girl got what was coming to her.
I have even seen mangaka like they guy who made Hellsing and fullmetal alchemist with that sick kitten shou tucker and what he did to his own kid I mean there are many more mangaka who do this, and who if the did Naruto would see Sasuke as a kitten who needed to die in the end.
They keeps saying it because they think it is the catch all defense. That it demises any and all complaints and criticisms any of us can lay out against what has happened to the Naruto franchise. It is like if you see a kitten kids show that is genuinely awful let say like teen titans go or powerpuff girls (let not get into a debate if they are good or not and just say they are bad for the sake of example) or a really awful kids movie. And when you point out how genuinely awful it is people just go "it for kids" which seem to mean "of course it's awful but we have such low expectations and respect for the intelligence of children we think they deserve to only get the absolute worst shlock we can think of."
Anyways who is Naruto target demographic? Shueisha is in the job of making money with their manga, so they will sell it to who every they think will give them the most profit. It has ran for over sixteen to seventeen years by this point the original target demographic of children are adults now even internationally. Also the kids now a days aren't gonna be as invested into the series as they would be for My hero academy or food wars both of which started in their life time so they can get invested in or one piece which is a huge cultural phenomena in Japan that everyone reads. Now looking at the last we can see that Shueisha clearly was targeting the international or more importantly Western or more accurately the US fanbase which was believe to be heavily supportive of nH. The problem is they weren't financially supportive of the series. So they instead shifted focus to the Japanese fan base (which they pissed off with the ending and everything after that) by making Boruto the movie. The thing is that the kids in Japan are once again they not interested in Bolt because it is currently running on nostalgia (which they do not have for the franchise) more then any interesting story, and the parents in japan who grew up reading Naruto are not gonna let their kids purchase Boruto volumes because they do not want their kids to be invested into something they cannot trust not to stab their kids in the back. Leaving the Naruto fanbase only with the Otaku the parasites and outcast of Japan.