I think I wouldn’t mind so much if there was some honesty about the philosophical belief aspect of the phrase and if we who work or volunteer in maternity and breastfeeding support, and those accessing those services could choose to use the language which reflects our beliefs.
For me “and birthing people”, “and birthing families”, etc are superfluous, unnecessary for communicating and so like a superstition or religious belief. It is like tacking “touch wood” or “God willing” on to the end of every sentence.
Fine, if you believe in using that language use it. However those of us who don’t should not be accused of being unkind or bigoted or shamed or pressured, we should not be harassed into compelled speech.
As other said to add “and birthing people” implies a belief in gender ideology or acceptance that it is the orthodox view. It changes the meaning of the word woman into a lifestyle choice rather than an inescapable fact.
I prefer the BPAS approach of using the word woman in general communication but creating specific resources for those who prefer gender neutral language. More organisations should take this truly inclusive approach instead of excluding all of us who believe that sex is real, matters and cannot be changed.
There is enough room in this world for a variety of beliefs and a variety of organisations to serve different communities. We should not all have to homogenise into one big glitter party of gender identity/queerness where no other groups can have specific needs recognised or met.