Women pretending to be men has happened throughout history. We live in a fucking patriarchy for god's sake. For some it has been the only way to get ahead.
If it was a better option for more women (ie you could reliably avoid rape or employment discrimination) more women would do it.
I don't doubt that men have got sexual kicks from dressing up as women for time too. Again, we live in a patriarchy! The subversive thrill, the humiliation kink, the sissy porn, all hinges on a society where women are subjugated. These things can only exist in a patriarchy.
There is also a history in gay men pretending to be female, more so in cultures that are even more patriarchal with higher levels of homophobia.
None of this is in doubt. Feminists point out that patriarchies are misogynist and homophobic and damaging to all of us.
Trans activism bowls in and says actually those brave women from history who pretended to be men ARE MEN (Jk Rowling has committed the sin of still being alive, otherwise they'd have transed her too). Those straight men who cross dress for thrills ARE WOMEN AND HAVE ALWAYS BEEN WOMEN. Those gay men who grew up with abusive homophobia too hard to battle ARE WOMEN AND HAVE ALWAYS BEEN WOMEN.
It doesn't take a genius to understand why trans ideology is fundamentally incompatible with feminism.