MtF and FtM are as much genders as fire is an element: they're not, they're just processes.

This doesn't make a huge amount of sense to me for a number of reasons
1. material composition is different then the product, especially living creatures.
2. People don't ignore intersex but it's pretty clear for the utility of a sex that they are not an exemplar, most of them being infertile. It's saying we need to study birth defects because that gives us a better understanding of humanity. It's not wrong, it's just this ought to not tell use much about healthy cases.
3. Genders. I mean there is generally a reason why we hit between the two, utility. I can look at what appears to be a woman and by checking off a couple ticks in my head i can go yep that's a woman. Same with a man and i can do it instantly. You ever try to do that with over 50 groups all of which are ill defined with a lot of overlap between the others?
And why the hell is trans appearing like 12 times? Every damn trans person i know prefers to be referred to as the gender they identify with. I mean i thought that was the whole damn point you TRANSITION into something else.