Cloning is safer - the perils of sexual DNA combination?

[Anomalocaris]

First of all...who decides what 'defects' should be done away with?

That's a prime example of a very slippery slope.

Some may prefer to remove defects -- others may prefer to encourage them.  What if we find a gene for narcissism, and narcissists decide everyone should be that way?

Still, I believe this will come.  People will voluntarily sequence their own genes, and will screen embryos for defects, and for preferred traits like "blue eyes".

The problem is many “defects” arise from combinations of genes that are individually harmless or beneficial.

In other words, if you want large number of people to benefit from some of a large collection of individually beneficial genes,  some sexual congress of possessor of these beneficial genes will produce defects in their offsprings.