That is a very valid question. We already have face-scans and fingerprint IDs so we are all treated as criminals. There is indeed zero point to have a binary-toggle field where one has to identify as either male or female. I'd like to add here that I don't care about this field; or I would want to check that I am an epic supergender, the very best - 'A' for awesome. But they don't allow this, so I don't want to have to care about this weird grouping I disagree with.