china in particular does not have the west's historical scruples wrt genetic editing and eugenics. i think this 'debate' will last about as long as it takes for the first generation of modded chinese children with two or three SDs on the mean to be brought into the world.
A lot of people are scared of GMOs, even if it's just a simple alteration to a plant. I doubt that genetic modification of people will begin in the west without significant outcry and pushback.
Sure, you can argue that homosexuality isn't an undesirable defect, but does Trump's victory in the recent US election make you feel like the people regulating this in the future really aren't going to see it that way? What is it you're optimizing for in eliminating mental defects that you're confident couldn't also be objectively be applied to other things this group would find appalling?