Why change gender?

Taking a break from all the dark humor and trolling around. I have a serious question.

Disclaimer: I support anyone wanting to change their own gender. It ain't hurting anyone and it's their life, their decision.

With that being said... why? I'm legitimately curious and want to know. I mean, to a large extent, society has come to a general consensus that we should do away with gender roles. We're becoming more open-minded to allowing boys to play with Barbie dolls or do ballet, while allowing women to ride motorcycles, play baseball, or join the military. We're not quite all the way there in some topics, but we're headed there. So... assuming the person reading this believes we should, in fact, remove gender roles, norms, or what-have-you, why would you want to change gender?