Given that you acknowledge physical
sex exists and the only way for trans people to be in objective reality, where sex is currently understod to be physical, the sex they perceive themselves as in their subjective reality, is to change what the words Man and Woman mean from physical sex to something else, a change that redefines every human on the planet based on something you can neither explain nor describe but simply accept because you think you see its shadow on a cave wall...
Please share the exact wording in which you would consider it acceptable to express the observation that since "man" and "woman" have unproblematically referred simply to physical sex for over a thousand years, that all the literature, history, laws and culture that refer to "men" or "women" had that meaning in mind, and since trans people, whatever the truth may be of what they experience and the basis one which they experience it, nevertheless remain the same physical sex, they really have no moral claim on the language, identity, rights, resources and history of the opposite sex. Furthermore, we should stop pretending that whatever they are subjectively experiencing makes them objectively any closer to the opposite sex in how they feel, think or act than anyone else is.
Please also consider the degree to which women, in the traditional female sense, on this thread and in society in general, are bending themselves over backwards to find a way to say "no" to frankly unreasonable demands without having that "no" dismissed out of hand without consideration of its owner simply because these aggressors on the female estate do not like the form of words being used. And consider to what degree those efforts are being taken in good faith, and to what degree those careful, resoectful women's efforts are being dismissed simply as "transphobia" anyway.
And then consider in that context, why JKR says what she does, and why she longer cares to twist her words and weaken their impact in the attempt to placate a group who will only ever be placated by silence and compliance.
As i often say, there's no way a woman can find the right words for a man to understand why she is saying no when he doesn't want her no to be valid.