That is a malformation that is addressed in the link from the British Medical Journal that I already provided: routine scans are useful in finding malformation, but the false positive rate needs to be communicated for informed consent. Scans can help individuals and improving the way individuals are targeted would be of greater help to families than routine scans for all women regardless of medical history, background, or risk markers.
Seriously, I only brought it up because someone said that it was extreme ideology to think that routine scans didn't improve outcomes, I was showing that the British Medical Journal and most international health care follow this evidence, bringing up individual circumstances (that have nothing to do with finding out what genitals a baby has) doesn't change the data.
Populations may be made up of individuals, but in a study of the population, it the numbers as a whole, not individual circumstances that are being looked at to determine the best policy for the population as a whole. It may help one person and harm another, which individual should we look at? That's why the effect over a larger population is important and the recognition that this information be stated for informed consent.
Maybe a better look at the genitals - regardless of whether parents are told - would help in the recognition and awareness of intersex people and genital abnormalities and could be argued for as could the ethics of charging to get around a policy meant to protect women from domestic violence.
Personally, I think that routine scan have now become a normally expected part of maternal care that any thought of removing them would cause a backlash that would lead to people trying to get scans of other reasons which would have more of a cost and currently, midwife care is so underfunded that scans are required to make up for the examinations and observations that would normally take place and be better for women and their babies. They are a catch-all for a broken system even when they do not improve things for the population as a whole. Scans are expensive but cheaper than a well running and well funded midwife system.