The evolutionary machine, natural adaption, and genetic defects can be fascinating stuff. Human performance can be affected so much by it.
As we unravel the science of genetics, it'll be interesting to see what scientists come up with. We'll have the ability to re-engineer ourselves; to fix fouled up messages; to even re-create ourselves in a different way.
Once we understand the science of genetics, we'll be able to engineer ourselves in specific ways for specific purposes. Should we? Shouldn't we? Why? Why not?
Followers of false belief systems have long resisted science. Genetics causes those folks to go off the deep end. I remember when in-vitro first came out, and the fits they pitched.
In the not to distant future, we'll be able to fix so much, or make so much.
Whether it's snake venom (used for bp control), mold (penicillin), algae poop (insulin), testosterone (steriods), The Internet, or any of a long list of technology, it's not the technology that's good nor bad, but, the application of it.
Folks who live in different parts of the world have their adaptations. Some folks leverage disease in a good way. Some folks have very different genes that allow different levels of performance, or that make them a mess.