I applaud you. You actually have some grounds for the suggestion. But this is proposed by the authors just as an untested hypothesis and in my earlier search I found nothing regarding a genetic predisposition.
At any rate as these cases are so rare and in most cases siblings of a chimeric person are normal and so is that person's offspring, there is no excuse to try to keep them from propagating.
I think you greatly underestimate environmental effects in placing so much importance on genetics. Many birth defects result from environmental causes such as illness of the mother (rubella), absence of necessary nutrients (spina bifida), or presence of foreign chemicals (thalidomide).
>>earlier search I found nothing regarding a genetic predisposition.
Think about Transplant rejection. A successful bone-marrow transplant results in chimerism. But many transplants are rejected. How does the immune system know what to reject?
Think about T-Cell receptors. Receptors are proteins.
Proteins are assembled according to the "Instructions" in DNA.
What's the primary method of DNA inheritance?
Genetics.