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We're at a slippery slope where we'll simply need more data points to better assess identification of medical predispositions based on gene analysis. Unfortunately, the negative externality that forms, and the one referenced when things like "should be" is said, pertains to patients' responses to this additional information. We don't even have enough data to full reflect on how patients are reacting to this information.

Right now, most medicine is reactionary-- confirming suspicions when patients are presenting x symptoms. These tests, however, hope to be predictive, and like many predictive aspects of life, will have associated confidence intervals. People, especially with regards to their own health, will have a hard time factoring in these odds when presented additional information.