It makes genetics different. Your argument sets the default environment to be fit for the stone age one. I can respect that, but it needs to be put explicitly m

It makes genetics different. Your argument sets the default environment to be fit for the stone age one. I can respect that, but it needs to be put explicitly more often than it is. It could go like "If we were to suddenly revert to, in the far future, some sort of stone age like environment, our distant descendants may be very unfit for that environment. This would be unfortunate."