This might not be unique to American comics and media as there are likely some anime that do similarly desexualise female characters or at least try to. The thing with Bleach’s that when they adapted a certain scene, the studio had to censor it to be make it aired on prime time telly but other family anime likely do the same or similar thing. There are likely some anime that do extensively desexualise female characters.
But I think for every Lupin where a female director turned Fujiko Mine into a more non-sexist character (from what I’ve read), there are more anime that keep on sexualising female characters a lot as to be off-putting to outsiders. Actually even fanart’s guilty of the same, though some do outgrow this. As for American superhero media, there are still bumps along the way but there’s active effort in desexualising female characters a lot.
As well as treating them right but to the point of intimidating some sexist readers. These same sexist readers have come to patronise misogynistic anime that I think it could leave an unhealthy impression of what they want women to act like. I think that’s probably why you don’t see that many anime depicting seemingly tsundere characters as byproducts of sustained abuse.
If that tsundere acts that way because she’s abused and stressed out by bullies and people who simply don’t support her, that’s too realistic. Same with making yanderes actually mentally ill as so depressed as to try to take control of their situation. I honestly think if DC had the guts to depict Stephanie Brown as angry from witnessing her dog being killed by Tim Drake, the effect’s the same.
Same thing if Tim repeatedly bullied her a lot that she loses her temper way too often. It’s too much like real life to be escapist and partly why a lot of anime circumvent the possibility of some characters acting this way from abuse or simple lack of empathy and support. Coupled with total or near lack of desexualisation it’s too much like real life.
It’s like if Steph started cutting her hair to support cancer patients and even bothers dressing in punk clothes a lot in her spare time, that’s readily toying with fan expectations that she’s already unattractive in tandem with her losing her cool whenever Tim treats her badly. Same thing would happen if that blond delinquent girl’s like this from being bullied at home for looking different that she acts out a lot.
It’s too much like real life where abusers are made accountable for their actions and where the abused act out due to constant abuse and neglect. Not to mention of their loved ones letting go of themselves or doing things nobody expected them to’s enough to desexualise them. In the sense of having a sufficiently independent sense of self that they’re no longer under others’ control.
Though that would mean some fans are secretly the controlling types who can’t trust people to be on their own devices even when some situations demand self-sufficiency. And partly why a lot of moe anime’s sexist.