[dragonwriter]

Genetic testing for what?

I'm just going to leave the headline of this article for you to consider while you answer:

"Report of Fertility in a Woman with a Predominantly 46,XY Karyotype in a Family with Multiple Disorders of Sexual Development"

https://pmc.ncbi.nlm.nih.gov/articles/PMC2190741/

[mothballed]

Before you hold genetic testing down to this standard of perfection (catching a single event of something so notable it merited its own article in JCEM), it would do well to compare it to the alternatives from which you are moving, and whether those alternatives met this standard of perfection.

Otherwise it might turn out you are proposing a standard that no system that bifurcates men and women can achieve, and on the basis of that, rejecting genetic testing.