So everyone agrees with me that it’s a factor that should be taken under consideration.
Sure, being heterozygous might be an advantage, but you have to weigh that against the effort and expense of checking every possible child in law. And there are better ways to get those advantages. I’d rather my child marry someone who is smart and not a known carrier of Tay-Sachs, for example.
Basically, I think our current system is optimal. We prevent the expression of disease without letting it factor into the decision.
writersoul: There’s plenty of evidence for this. PubMed is a good resource for finding studies, or one can google heterozygote advantage to read it in a more entertaining format.