All of your arguments could apply to cosmetic surgery just as well.
I don't agree with your wholesale assertion that all of those who are unable to afford cosmetic surgery (larger breasts, hair implants...) are suffering, however.
Cosmetic-only editing is pretty analogous to cosmetic surgery, I grant you that.
But if cosmetic surgery made you smarter, then clearly all who couldn't afford it would suffer (relative to those who could). We don't worry about that because cosmetic surgery doesn't have that potential (or does it? I dunno), but with gene editing I think it's a very real potential.
That's not to say I'm wholesale against it, nor would I support banning research or anything along those lines. But I think it's clear that it will be a huge shock to society if/when this becomes practical, and I don't think our society is particularly good at dealing with this kind of change that can only exacerbate existing issues of inequality.
Let's hope that as a civilization we have enough sense to sort out making it available to everyone by then, at minimum in the most obvious areas (preventing disease, avoiding birth defects, etc...)
I don't agree with your wholesale assertion that all of those who are unable to afford cosmetic surgery (larger breasts, hair implants...) are suffering, however.