I’m guessing bc anti-abortion people are so vehemently against it that it has too much connotation with their propaganda for politicians to think they’d net-gain public favor using that word
Also because “reproductive health” doesn’t only mean the right to have abortions. IVF for example falls under that, i’m pretty sure
Btw regardless of what side we each might fall on in this highly productive abortion debate (which mostly relies on whether someone’s religious), this is all happening in the human layer/fiat matrix and politicians never say what they mean anyway, so a) it’s complicated, and b) why would this be any different