Anyone Else Feel Guilty About Changing a Sim's Genetics?

I have no qualms adjusting Sims in CAS. I have to look at the Sims for many hours, and I want something fairly decent to look at. Usually, I'm successful in preserving their overall dominant features only without the inherent distortion. The genetics in The Sims 4 don't make much sense to me. Often the parents' worst features are passed down and the effect doubled instead of settling somewhere in between or even just towards one or the other parent. Why offspring's features are so painfully out of proportion, I have no clue :/