Imagine the implications -
- No more "assigned sex at birth" nonsense
- No "intersex" nonsense - there will be males with DSDs, and females with DSDs (just as there are now, of course, IRL)
- No clownfish humans
- etc
A lovely thought, but I don't think it will work that way. They do complete sequencing but then probe for specific conditions in the 'useful to know' category.
Of course they'd be nuts not to look at karyotype, and that would immediately pick up the abnormal ones, but those don't lead to sex ambiguity as such, but global developmental anomalies that involve the reproductive tract (and which can also be caused by environmental factors).
The interesting, and very rare, conditions involve a karyotype which looks normal but behind which is hiding a specific genetic difference, such as an XX containing a translocated SRY region or an XY accompanied by a defective or missing SRY region or defective or missing genes related to T-processing or T-receptor formation.
I'm not saying they couldn't probe for any of those genes, but they don't need to do it for every baby in order to spot the individuals for whom this is an issue: a simple comparison of the karyotype with the actual baby is enough! Once the issue is detected, there are various diagnostic options of which gene probing is only one.
I fully expect that XX males will continue to be registered male, and XY females as female. And maybe fewer will slip through the net, and be taken by surprise at puberty or when TTC.