think of people actually starving and not having enough money
Apologies for being a little facetious, but if self-id comes in, women can kiss goodbye to any hope of pay equality, because the male type of women - "coincidentally" paid more - will drag the averages up and be exemplars of how "women" aren't discriminated against.
Ditto getting jobs or promotions in the first place - any woman of childbearing age can kiss nice career enhancing moves goodbye when the male woman is never going to need maternity leave.
Pretty much anything that supports or prioritises or advances women in life can be negated, when male women prove the issue simply doesn't exist any more.
How's that going to affect women who already have it worse off?