[tptacek]

Late to this, sorry for the necro-post, but this is not at all a consensus. The 50-80% number comes from twin studies from the 1990s and predates within-family and GXE, both of which knocked the estimates sharply back. "Highly polygenic" is probably doing the opposite of the work you're hoping it does. And, of course, "heritability" doesn't mean "genetically determined"; my propensity to wear lipstick (nil) is technically highly heritable, while my number of hands is barely heritable at all.