my ob also didn't order the late term ultrasounds, despite us both being carriers. Her reasoning is that there isn't anything we can do about it at that point.
When I mentioned to her that if we have a subsequent child, I'd want the late term u/s to be prepared and she looked at me, a little bit horrified, and said, you realize you can't terminate at that point. Then i explained to her how much I didn't like the MI surprise this time around.
But, I understand her reasoning. Not sure I agree with it, but I understand it.