This is what I cut and paste when the subject of womb "transplants" into tranwomen comes up:
This business of uterine "transplants" into men appears to be about science but it is not. It's about getting the idea out there that men can give birth too, but not just yet, there are a few technical details to be sorted out first. So while we're waiting for the inevitable, let's get on with the social sciences side of things and accept that since men can give birth too (not yet, but soon, soon, it's bound to happen), then there are no real differences between men and women in terms of things that are material and significant, they're just bodies with an interchangable set of parts. The actual differences are surface ones like the chosen forms of appearance.
It is about trying to change how people think by assuming a medical horror is a run-of-the-mill thing just round the corner. It's Overton Window stuff, not science.