In the US, it is illegal for an employer or health insurance company to discriminate based on genetics [0]. But if you fail to receive a promotion because your employer found out about your genetic disease, how would you know?
Same way you get to know your KPI's and other assessments?
I guess that act is good after all. No one can tell you've got an actual disease from these tests, even if on big scale the correlation most obviously is there.
[0] https://en.wikipedia.org/wiki/Genetic_Information_Nondiscrim...