Three pages late to the party, but the thing is transition is never about attractiveness or looks. A lot of guys or girls look attractive pre-transition but that doesnt matter because that's not them, if being trans was about being ugly, so many people with low self esteem would transition to the other sex because they'd supposedly look prettier that way, but no one ever transitions for looks.
Does it play some role? Sure, dysphoria might make people feel negative about their bodies, not take care of themselves, or not view themselves favorably. Vice versa, they might look at the aesthetics of people on the other side of the fence and be like "I want to be pretty like that!" but that isnt to say a general apathy or dysphoria for one's own current gender doesnt come into play.
My case, I could be considered pretty, I guess. I liked my body, I was cute and all...I bet if people looked at me Id look good. I hated being girly though, there was a very strong impulse to move the other way, look different, etc. I look good and feel better now, not just look good.