I already stated why, but I'll say it again.
Pregnancy is a medical condition. It is temporary. It does not speak to the social status of the individual.
A pregnant person is a person who is currently pregnant. They're currently experiencing that temporary medical condition. Therefore, it does not speak to their social ststus as a person.
Got it?
In that same vein, a birthing person would be a person who is in labor and actively in the process of giving birth. If that's how it was being used, that would be fine. It would also delineate a temporary medical condition and not speak to the status of the person.
But that's not how it's being used. It's being used to describe persons who have the potential of becoming pregnant, whether they actually are or not as a means to "make space" for persons. who cannot. It speaks to the social status of the person by describing them as a function of their biology, rather than a person. It's pejorative in nature There's a historical context here. The term harkens back to when women were considered little more than brood mares. It's callous and mean spirited.
I'll remind you that while that little gem was coming to fruition, it was alongside some others like "breeders" and "bleeders".
I can't speak for Canada, you have your own way of doing things and that's cool.
But. Given the fact that reproductive rights are under assault in my country and some of this same language is being used by conservative state legislators with alarming regularity...for the Trans community to dig their heels in on this one is a tactical mistake that WILL bite them in the ass.
Fortunately, at least over here the medical community seems to be making the right call. They're going with pregnant person.
Transpeople still going on about this are just making the Trans community look petty and vindictive. They should take the win of gerting some inclusive language and let birthing person go. It's not necessary to achieve goal.