why do people who nominally place so much importance on chromosomes, all of a sudden shift their footing when you point this out
Trans Definitions, Edge cases, and Bret Weinstein

Because their argument isn’t sincere. It’s a bad-faith attempt to justify the status quo and thus avoid coming to the conclusion that we have to revise our understanding of sex/gender models. Revision is work; justifying status quo is effortless. Just, “it’s right because it’s right.”