The only reason I don't worry too much about it at the moment is that IVF requires harvesting just about 15 eggs, no more no less, from the mother for the highest probability of live birth. Sperm cannot be genetically chosen simply because it destroys the sperm in the process. So you have 15 random eggs fertilized by 15 random sperm, theoretically you could choose the "best singer" or "best athlete" from a pool of 15 possible kids, that's not really something I'd worry too much about. Certainly a more debatable process though.
Eventually growing eggs from stem cells will be a thing, then the above gets a little hairy. Obviously there needs to be some kind of restriction on scientific progress like this, but I think the bar should pretty much be set where we are right now.
Genetic engineering is another subject completely. Altering a "athletic" gene in an embryo could have terrible consequences. I don't think that would ever be morally justifiable.
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