Thank you @YouSirNeighMmmm
You've got me really thinking about now - It's all bliddy confusing (as I think it is intended to be).
I still don't think that "gender dysphoria" can exist (or at least not in the way that trans people use it ie "I'm a man who likes a frock, so that means I'm a girl") because they are using "gender" as a synonym for "sex", which it is not. As gender is a social construct which varies from culture to culture and age to age, it can't be defined the way sex, which is biological and unchanging can.
I fully agree that many people are uncomfortable with gender roles/expression expected of their sex - and good for them! Smash those stereotypes! We will all be a lot freer and happier without them. There is no reason why men, if they want to, shouldn't wear make up, or clothes which are associated with the female sex, and vice versa. You could argue that women are fortunate in that they are much freer to wear what they like.
However, despite what they might claim, TW are NOT smashing stereotypes - they're desperately conforming to them by adhering largely to the stereotype of the "sexy girl" (in their minds, at least). Can't say I've ever seen one coming out as Hilda Ogden. No-one changes sex - sex is physical and innate, and no matter how much surgery, how many hormones an individual ubjects themselves to, all changes are surely cosmetic.
I agree that sex dysphoria is a subset of body dysphoria. I used "dysmorphia" because I think that genuine transppl perceive their sexed bodies as being so appalling that they can't come to terms with them. I think that these people are a tiny minority, and I also believe that they should be supported and helped as much as possible
(I have to admit I got myself tangled up in the differences between the terms "dysmorphia" and "dysphoria" and I had to look up definitions to try to sort it out in my own mind. I'm still not sure I've got it properly worked out.)
I agree with the two points you made in your post re: surgery etc. Only true dysmorphic individuals require (or will benefit from) surgery.
I had typed a lot more other stuff, but reading it over I realised that I risked a ban for some of the descriptions I used,* so I've deleted the rest. But thank you for your comment - it really got me thinking
*They were not untrue, rude, or unkind terms - just things that some people on here don't like to read on here.