You know, for some of us our natural heritage isn't that far back. Our grandparents (Yeah, I'm talkin' about people
our age, Quarky.

) were born in an era when this whole 'germ' thing had just managed general acceptance in the medical community, and most of the 'guy on the street' kinds of people still weren't too sure about the whole idea.
(My grandfather got his M.D. just in time to be practicing at a Navy hospital in Boston when the Spanish Flu pandemic hit. I'm not surprised he ended up as a forensic pathologist.)
That heritage you're talking about also includes an infant death rate so high that it was a common occurrence. It didn't happen in
every family by then, but it happened enough that
everyone had friends or family who had lost a child. Probably both.
Even after adjusting for infant and child death, the average lifespan of someone who was born at the end of the 19th century was still decades shorter than it is today.
That was the natural system. That was the heritage. I don't mind giving that up very much.
And along the way we have also learned how to cure or at least alleviate many other health problems which we were unable to before. Sometimes ones we hadn't even yet put a name to, that we didn't even know we
could do anything about.
How do you propose that we pick and choose which ones to address? What is the scale we use to draw a line between "This is our heritage." and "This needs a cure."?
Some people used to become "demented" as they grew older. Now we know why. We even put a label on it. Alzheimer's disease.
We can't cure it yet. Should we stop trying because it's our heritage? It is a natural system, after all. Maybe we should just interact with it like we used to.