These are all arguments that apply to the house you live in, the blankets on your bed, the medicine you use. You are absolutely fine with all of those - you don't live in a cave, shun treatment for infectious disease, and wear furs. In fact I would go so far as to say that you probably think that modern technology is a good thing, and you are better off for it. Yet that already greatly manipulates your proposed optimal condition for the human species. So why does treating aging as a medical condition bring out this view? This seems like a very selective appeal to nature.