WARNING: GENETIC ENGINEERING IS DANGEROUS. Maybe genetic diversity does not always connect with both dominant traits and dominant genes. Potentially, and possibly, a genetically engineered somatic mutation could automatically give people recessive traits. Potentially a genetically engineered germinal mutation could automatically give people recessive genes. Mutations may actually add genetic diversity, so long as human individuals are NOT removed from the gene pool.
https://www.researchgate.net/publication/383114924_EIP_then_RPD .