[jfengel]

They're already in an arms race about performance enhancing drugs. And even without those, there are artificial limitations like age in women's gymnastics, because of the damage it does. Football players are grappling with decades of head injuries.

If you want to know the very best a human can do, you will destroy them. It's just not a question we can safely know the answer to.

So it's never really going to be fair, and we need to ask a different question. Exactly what that question is remains to be seen.