Yeah, I get that there's this whole innate compulsion that tells trans people that they're in the wrong body type and such. The thing is... how I can put this?
It's like if your car is painted red and you feel it absolutely has to be painted blue no matter what, and then other people are making a big deal about the sanctity of your colour scheme, and how you can't be a colour swapper...
To me it just feels like an incredibly cosmetic and shallow detail about myself.
(Bear with me, here, I'm going to use stereotypes to make a point.) The difference is that people treat you different if you drive a red vs blue car. If you drive a red car, people expect you to brofist, drink beer, grow chest hair and a beard, enjoy sports, wear pants, pee standing up, and only own one pair of shoes. Furthermore, the red car constantly tries to con you into doing certain things, because the car is full of advertising all the time. You hate this fucking car. The damned thing is a gas guzzler with monster truck tires, a stereo set to full blast that you can't turn down, and a rebel flag painted on the doors. This car doesn't fit you. You're not comfortable in pants, don't want to grow a beard or chest hair, don't like sports or beer, and like shoes. What you'd really like to drive is a nice, blue sedan, with heated seats, regular sized tires, and advertising for stuff you're actually interested in, like that new romantic comedy that just came out instead of BLOODSPLOSION II: THE BLOODENING. You tell a friend about wanting to change cars, and they get extremely upset with you, calling you names and shunning you. You still look at all the blue cars at the lot, though, wishing you could drive one, no matter how many people try to pass laws against you driving a blue car, or how many friends you lose because of it. The feeling's never going to go away.
Your gender is a small detail, right up until it's not. For some people, it is the thorniest issue that they face in their lives, mostly because some people make a huge deal out of it, particularly lawmakers. Expectations and gender roles still run rampant, and until we can demolish the cultural barriers that have been around for hundreds of years, this isn't going to change, and it's not going away anytime soon.