It's still immoral in the end. Pornography in any form is bad for your brain and you are best off just not consuming it. Even if not every creator of hentai is a vile sex-pest, all of them profit from people who often suffer from an addiction and the material that they make is knowingly damaging to those who consume it. When your moral standards are low enough to get to that level, making hyperdegenerate material is not that much of a step lower.
OK there, puritan. Like I get that porn can be an addiction, but the keyword there is CAN. What do we do, ban all porn? What's next, then? Cigarettes? Alcohol? Junk food? Video games? Do you realize how absurd you sound?
Porn and sexual material can be just an outlet to help people relax whenever they're stressed out during the day. You might have a point when it comes to the porn industry, mainly filming live-action porn. But let's not pretend that some guy or girl making an indie R34 animation by themselves with friendly associates needs to have their material banned, especially if it just depicts normal sex.
I don't even drink alcohol or smoke cigarettes, but banning those is just going to make things worse (gangsters rising up during Prohibition being one of the more prominent examples). You just run the risk of people being so pent up and frustrated that it makes it harder to use an outlet that helps them release their stresses.
Sure, stuff like smokes and alcohol isn't healthy to begin with, but not everyone has the luxury of finding something else as a more healthy outlet that works for their mind and body. And when you have people more pent up, you run into the inverse problem of people being so stressed that they become less sane and more unhinged. It's all about moderation.
Not everyone needs to engage in outlets that can cause addiction, but let's not remove those outlets and make it worse for the people who can have the capacity to moderate.
Dude, are you for real? Oda, the man who wrote Ivankov, a drag queen who turns men into women by injecting them with hormones, the man who wrote Momonosuke who suffers from the EXACT same issues that you critiqued Dragon Maid's Shouta for, the man who wrote like every barely-disguised fetish under the sun does not go too far with the goon content? I enjoy One Piece in select arcs but if it wasn't sunk costs, I would have just quit it. It absolutely is a very degenerate piece of media.
Like, there is a way to make women sexy in a tasteful way. Honey from Space Dandy, Fujiko from Lupin III (Depening on the show, of course. TWCFM is complete niggercoal. I am mainly talking about her in Part 1, 2, 4 and 5) and Faye Valentine from Cowboy Bebop are good examples of that. I really don't know why you picked Oda out of all people for this argument.
I don't personally care for the progressive trans stuff Oda put in like Bon Clay, Ivankov, Yamato, Kikunojo, etc. I think if the world wasn't infested with troons like it is today, Oda's trans characters would have been dismissed as odd but nothing to get worked over (Oda has so many inspirations in his story, I guess he felt the okama way of life was something amusing he wanted to put into his work). I just don't get worked over those characters because I know there's media far more obnoxious and in-your-face about the trans nature of their characters (especially since at least Oda didn't put in "trans kids" so far).
Also, Momonosuke is a bit different than Shouta in that he was more aware that being a boy allows him to get close to adult women (which is given disapproval by the adult men, albeit as a comedic gag). When his body gets older, he gets shut down when he tries to get close to women again. And that gag with him inside Yamato's clothing is a spur-of-the-moment event, not something Momo planned on to begin with. Oda may make jokes you don't like and I don't laugh at every joke Oda makes, but the dude still has some restraint, keeps focus on his overall story, and isn't as degenerate as I've seen other anime show off, whether or not they're shonen.
I think in Shouta's case with Kobayashi, they could have had the same gag but have Shouta be a young adult man who's sexually with-drawn. Lucoa's care-free and motherly instincts, while still adorning her risque appearance, would have worked better for a young adult man who's attracted to her but doesn't want to take advantage of her, keeping the comedy and preventing the bit from being obnoxious with how long it's drawn out.
I guess the Kobayashi example in particular stood out to me because there was an anime that came out around the same time as Kobayashi which was nothing but a fully stacked adult woman looking after a little boy and constantly teasing suggestive imagery, and that little boy even gets a harem with that adult woman and some teen girls. It's not an actual harem, but the comedic tone didn't help either. It just felt like the creators didn't realize that the comedy works better when it's sexually with-drawn adult men being teased by older adult women, not little boys who shouldn't receive that kind of teasing to begin with.
And nudity of attractive woman by itself doesn't have to be tasteless (whether it's PG-13 fanservice or the more R-rated variety). Even if it's just a simple context like "hey, we've got a badass sexy woman, let's put her in a bath/shower" like in '90s fighting game OVAs (Street Fighter, Tekken, Fatal Fury, Battle Arena Toshinden, etc.), it can still be better than a more disgusting context like "hey, let's have guys intentionally strip her, stare, and even take pics for our amusement." Whether the context is simple or not, it's all about how you frame the sexiness.