It's childish because you CAN'T get to a height considered "tall" without either ruining your body proportions, risking getting post-surgery complications, impairing your motor ability or your athletic ability. You're only trying to convince yourself that to not feel terrible about the fact that you won't be close to that height even after having your legs surgically snapped in f*cking half. Wake up. You're lying to yourself. There's nothing childish about wanting to be 6'3" if the logistics are there. Just because I have different goals than you, doesn't mean mine are any less justified or worthwhile. If anything, I'm probably getting more out of this surgery. Stop being so fking bitter.
Child, speak with respect like most of us speak to you.
You talk to much older and wiser men than you who some of them like me have already done this surgery and know what they are talking about and not some teens who don't know what they like about themselves and came in a forum to discuss a so hard surgery while they live in a country where the average men are shorter than the west and also you are way above averagen
And no, 6.4 is better than 6-6.1 for you, not for everyone and not even for the majority.
Most 6.4 men look disproportionate and skinny and for no reason this height isn't more aesthetic than a 6ft body which is the upper limit when you can have good muscles and look tall and proportional at the same time.
Even Momoa you mentioned looks masculine due to his face. His body is ectomorph and with huge struggle in gyms he looks built, not even muscularar.
So speak at least with respect and keep in mind that your opinion is completely personal and yhe majority completely disagree with it or go to anold forum to talk about something else you don't like in your appearance and come back here when you grow up and be at least adult.