Why are we not genotyping all newborns in the first world for their medical record? It isn't that expensive and genetics is not really something new or untested either. In fact, so much is known about genetics and homo sapiens, that one wonders why health care is doing so little with our genes.

Advantages:
1) Risk factors for disease will be known and can be recognized early and anticipated for at early onset, which is great for illness prevention and early treatment, autism spectrum disorder for example could be treated within critical learning periods with far greater success that at later periods in life
2) Pharmacogenomics: we can calibrate both type and dose of drugs to the genome of the individual to increase effectiveness and save costs since some drugs simply do not work with specific enzymes encoded by particular polymorphisms
3) Diagnosis will be much easier when genetic susceptibility for certain diseases is known, but to be fair works only for those illnesses with a strong genetic component and has the downside of risking tunnel vision in the medical practitioner