So I read your whole op, and I find that I don't resonant much with any of your arguments. I don't find it that complicated, to merely draw line somewhere before the fetus is viable, and not be an authoritarian about it if she has do it a bit later, for any number of reasons. Likely, the longer she waits, the more devastating it obviously would be for the would - be parent(s). I assume there is a good reason why they did it. But again, to me, all that is at the absolute bottom of the stack of my concerns
For all that you wrote, you don't write much, if at all, about what I am extremely concerned about. And to discuss that, we have to pare this all down to more of logical mode of thinking. I am concerned about the carrying capacity of the planet itself, and I am concerned about how well grounded the parents are, in any number of domains. I seriously wonder about the future of the human race itself. All of that, comes way ahead of whatever this problem is, that deals with when the transformation into 'human' occurs
And no one seems to really want to look at it that way. So I am kind of the lone voice on this, coming from that angle.