They do, but not so much that your average home user would notice without having more than enough time to fix the problem.

Read it as 120TB at first and my eyes nearly jumped out of their sockets.

the male characters are in nearly all the leadership positions, and the female characters are left to play support.

Wow, almost like it’s a traditional SHOUNEN.

Yuzuriha: primary purpose is motivation for the male protagonist

Straight up false, she’s only seen as an idol before being revived (understandably so, what the hell can a stone do except look pretty). Immediately after, she’s treated as a skilled member of the party. I’ll give you that the author loves drawing her from behind.

Kohaku: min-maxed strength and dexterity at the loss of intelligence, wisdom, and self-initiative

Again, false. She’s not dumb, if anything she’s pretty smart and on top of things - only she doesn’t have any knowledge of the civilized world, being a new-worlder and all that. I went through the manga, and from chapter 9 (her introduction) to chapter 26 (got bored after that), there are a total of 5 panels where she’s “sexualized”, all of which self-censored by either scenery or speech bubbles.

Ruri: helpless sick girl (omg that shot of her being fed medicine)

OK, that shot was “sus”, as the zoomers say, but being a helpless sick girl was an essential part of the plot, not some fanservice or male superiority complex.

Kirisame: zero self-initiative (mindlessly follows orders), and that outfit makes Kohaku look like a nun

During the first half she’s just a goon, which is what I’d actually like to address here - if anything, the later parts of the story lose focus and start being more about fanservice.

IMO Demon Slayer is one of the more kid friendly animes out there (of its genre).

If you dislike the gorey scenes like decapitations, but are fine with only blood, Saint Seiya is a great classic – five boys fight to protect the goddess Athena from the forces of evil. From memory, there are no scenes of dismemberment, and sexual fanservice is pretty much nonexistent. Lots of magic blood flowing out of bruises, though.
Saint Seiya Omega is a newer, even more kid friendly sequel. There’s still some blood, but it’s definitely muted in comparison.

Nearly all the female characters (especially in the first half) are vapid and highly sexualized

You’re joking, right? Sure, some female antagonist characters are like that, but Yuzuriha is an essential member of the party portrayed as hyper-skilled, Kohaku is super strong, smart and doesn’t fawn over the protagonist despite clearly having feelings for him, Suika is literally just a silly kid, etc. Just because they’re using relatively revealing clothes (which aren’t even that revealing, mind you) doesn’t make them highly sexualized.

US-made cartoons significantly less likely to contain problematic content for US culture

FTFY. Also kind of obvious that content created in a country is more likely to follow the sensibilities of said country.