I read it, I liked it, I felt like it was not written very objectively.

There did not seem to be nearly enough self-doubt or testing alternate situations.

And it shouldn't be terrifying. You no longer have to worry about animals trying to eat you, finding enough food to eat yourself, dying of infection, or physically defending yourself on a day to day basis.

If the worst thing that's wrong with you is sub-optimal sleep, you've got life pretty good.

We're getting down to solving more and more subtle problems. Sleep, the biological contents of your digestive system, and environmental exposures look to be the big health problems on the table to solve in the next few decades.