I've seen the term used with extreme usefulness, even within the trans community.

Studying male/female socialization is extremely useful for binary trans people who want to pass and assimilate into society. Maybe it's not useful for the most gender rebel nonbinary folks out there. And more power to such folks. But we shouldn't gatekeep trans identities and invalidate the experiences of binary trans people.

And yes, you are making the exact mistake I suggested:

More current, is the concept viewed from intersectional feminism, which criticises the fact that flattening down “male socialization” in this way does a disservice by excluding other, perhaps more prominent social and circumstantial factors which all contribute together, such as race, class, disability, sexuality, nationality, etc.

A description does not have to be perfect to be useful. All models are wrong. Some models are useful. Gender socialization is not the sole determiner of behavior. It may not even be the greatest single factor of behavior. But that doesn't mean there aren't broad averages that are still very useful to reference in the right context.

For example, men are generally socialized to take up more space than women are. And this is true across many other axes. Across most cultures, religions, income levels, etc. Men are encouraged to be big, bold, and be heard. See manspreading. Women are encouraged to be smaller and take up less space. Maybe you can find some rare culture in history that this wasn't the case. But it's true for the cultures that the vast vast majority of human beings on this earth live in.

And this is not simply an academic matter. For a binary trans woman seeking advice on how to pass better, "take up as little physical space as possible" is actually fantastic advice if she isn't already doing it. You can have a body, face, and voice that are read as female. But if you sit down a couch, wearing a skirt, and spread your legs wide instead of keeping them crossed or closed? That will immediately out you as a trans woman, or at the very least draw attention to you. Women generally are socialized to close their legs when they sit. Maybe that's not true for the Sentilese, but for an American woman living in the US in 2026, it's certainly true in far more cases than not.

Passing is all about appealing to societal averages. Again, if someone doesn't care at all about passing, fair enough. But we should not invalidate the experiences of those who wish to pass. And for those that do, studying their socialization and adjusting their behavior accordingly is something that most of us have to do.