Sighs. Fires up internet on a sunny evening, knowing it makes no difference to your point of view, but I'm coming back for the lurkers, like I was a while back. The more you post, the more they go 'eh?'!
The reasons for the 'big tent' you describe are pretty obvious:-
Transmen are, by definition, biologically female and very likely to be female-socialised from birth, so are unlikely to make such a song and dance about getting into male-bodied spaces as male-born people do about getting into female spaces. It's socialisation, baby!
Feminism exists because the power balance between males and females exist. Sex and sexuality also has a power balance entrenched.
Therefore:
Why are men not campaigning for the definition of men? Because no one with power is pushing against the definition of male. Females, even when they identify as transmen, rarely have the platform or power to campaign.
Gay men are not protesting at Pride to exclude trans men or with banners about gay erasure. Because of the sexual and physical power imbalance, most sane people here realise that transmen attempting to upturn the definition of homosexual men are on a losing wicket from day one. And if you look, the majority of transmen appear to be 'straight' - ie attracted to females (ie they're technically lesbians, so not concerned with gay men dismissing them).
(Though I can see a gradual thought-police ideology growing, and more and more gay men saying 'fuck that shit')
There's no real definition of the trans umbrella, just a collection of various groups. Whoah-hah up there. There's a fantastic definition that official bodies seem to be swallowing, as many of us have shown you via Stonewall and people like Tara Hewitt. You seem to ignore our evidence that definitions now include the drag queens, the men with a sexual fetish, the part-time trans that the big guns acknowledge. You refuse to engage with anyone asking you what your definition of a transwoman is.
The only people who obsess about definitions are gender critical feminists, and pretty much to exclude trans women. Obsess. That's an interesting word. Almost aligned to being 'hysterical'. Just 'irrational women' getting their 'knickers in a twist'.
We're 'obsessing'because we can see how this ideology is directly affecting and challenging the protected rights of biological females.
I'm not sure if you know this, but a female's stamina increases as she ages. Ultra marathon runners who do well in later age are often females. Like Sia says 'I've got stamina'.
(Sorry to those who don't like pics/links:)
(And yes, to anyone who says 'oh but Sia supports trans rights - I do too, just not those that quosh female rights)