I personally think it makes more sense due to trans men who become pregnant and would like support without being misgendered.
As a pregnant woman who is undergoing a uniquely female experience, I would like for that experience to be recognised, not erased. I would like not to be gaslit into believing that anyone other than a female can give birth. They cannot. I find it offensive.
I've noticed that a lot of doula websites refer to 'people who are pregnant', which surprised and disappointed me. So much for empowering women.
I've also been reading Give Birth Like A Feminist, which is an excellent read. If we want feminism to make a difference to women's birth experiences, we have to recognise birth as something that only females go through. Birth is a feminist issue.
Fortunately, the official literature I have been given so far during pregnancy talks about women rather than 'birthing people' or some other euphemism.
As for misgendering... Given the numbers of ftm transitioners who will need to undergo hysterectomies in order to avoid vaginal atrophy and other health problems arising from taking cross-sex hormones, the number of transmen becoming pregnant is going to be pretty rare. Furthermore, given that an mtf transitioner would have to come off all cross-sex hormones for the duration of pregnancy, I'm also not sure what the difference would be between a transman and a woman. And finally, I find it difficult to believe that someone with severe gender dysphoria would be fine going through pregnancy and childbirth but traumatised by being referred to as a woman.
It also very much annoys me that I have had to use the term 'anyone other than a female' in this post in an attempt not to have this message deleted.