My inner armchair psychologist might wonder if that's because the reasons for transition in the first place are different between men and women.
Perhaps transition, for transmen, is felt as the solution to a smoother life, because it's got to be easier being a man than a woman. Maybe there's an inherent commitment in being a transman to making this happen.
Whereas transition for transwomen, detailed in their own autobiographies, seems to be born of a potent mix of shame and internalised prejudice. Left unchecked and forbidden to be psychologically explored (because transphobic) this appears to give rise to a dangerous viciousness towards the class of humans they say they are part of. There's zero commitment to being anything at all like an actual woman, it's all colonisation and appropriation and tantrums when they hear a "no". (Not all transwomen are like that, of course. But bizarrely almost all the transwomen championed by the Guardian and BBC.)
Or perhaps the root cause is similar for both sexes but the way of dealing with it is different because of socialisation and the patriarchal world we live in.
Transwomen's "top dog" status is alive and well for the most part though. Women haven't achieved equality yet.