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It’s grounded in the reality 99.98% experience - that individuals are biologically differentiated into the male (inseminating) or female (gestating and nursing) reproductive role.

Stress reproductive role there - as unique individuals they have limitless other personal and social roles they can fulfil, and to be honest I don’t see these as naturally gendered, nor feel it would be desirable for it to be so.

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Well, you could downvote - but, given as the first paragraph seems to be biological fact, perhaps you could instead mount a reasoned defence of gendered personal and social roles, and why they should have primacy over sex as defining components of the identities of “man” and “woman”.

As someone born in the 60s, a time when gendered roles began to be considered limiting and harmful, I would genuinely love to see a defence - at least one beyond “It makes people with gender dysphoria happy” (which is a good thing, but not obviously the right thing given the opportunity for discrimination between genders and expected conformity to normative gender stereotypes).