Too complicated. And certainly does not need special mention in our constitution as transgender people are already protected.

Arguably we use pronouns based on how a person looks. I have inadvertently referred to a woman as a male because they "looked" like a man. Once I was told I was in error I simply used the correct pronoun from then on. It is a simple matter of respect. But I would not want to have been considered a criminal or bigot because I errored.

WRT how many genders. Again too confusing. Having just male and female seems sensible. If someone is in transition they usually identify with one while transitioning to the other or trying it out.