It's a can of worms, just consider an everyday situation, women and girls going to be fitted for a bra in M&S and then finding the person in the adjacent cubicle is allowed to be there because they are identifying as a female. Some won't feel comfortable in situations where they need to change their sanitary wear in toilets that are no longer designated as a place for women. What of changing rooms? I belonged to a health club until recently where most women and girls were partially or fully naked after showering and changing following swimming or gym. What about the women whose religion have strict parameters about modesty and the definition of two sexes, and are precluded from being seen in a state of undress by anyone other than their husbands, do they not matter?
It is a fact that many women are not comfortable with the proposals that are in the offing, and why should those women not have their voices heard. One only has to look at the numerous threads over on MN, a younger demographic in the main than here, to know just how many women feel they are being thrown under the bus.
Look at the shed load of shite that came JK Rowling's way when she had the temerity to suggest that it was appropriate to say "women menstruate" rather than people. One of the tactics to discredit it her by the vociferous opponents of free speech were to put umpteen one star reviews of her new Robert Dalgleish book up on Amazon, didn't do them any good though it still went to number one in the hardback charts.