It's the NHS who came up with that rule originally. The idea being that young people would have that appearance for a period of time before making the permanent decision.
Are there specific types of 'appearance' which are deemed suitable for only men or only women? Is there a list?
Trans people cant win here. If they dont transition, they're men trying to break into womens bathrooms, if they do transition they're wrong ans ruining their bodies, if they have mental health issues that's denied, . The other side will nor ne happy until trans is eradicated and that is wrong. They also need to acknowledge the damage they are doing with their opinions.
What do you mean by 'transition'? Many people who identify as trans make no changes at all to their bodies. Over 90% of so-called 'transwomen' have a penis and have no intention of changing that (I think it might be a lot more than 90%, but I'm not sure of the actual figure).
It seems that it's only children who are really targeted to make physical changes to their bodies, often in early puberty, when they cannot possibly understand what effect this will have on their lives as adults.
Who is really doing the damage here?