That sounds a very strange expectation. Most of my life post university I realized most of questions have complex answers, it is never as simple as you expect.
If the author would check how things biology and medicine work currently, I think he will have even more surprises than the fact that counting populations is an approximate endeavor.
I find the complication comes from poor definitions, poor understanding of those definitions, and pedantic arguments. Less about the facts of reality being complicated and more about our ability to communicate it to each other.
Apparent simplicity usually comes from weak definitions and overconfident summaries, not from the underlying system being easy.
Complexity is often there from the start, we just don’t see it yet.
~1200 - omg chess is so amazing and hard. this is great.
~1500 - i'm really starting to get it! i can beat most people i know easily. i love studying this complex game!
~1800 - this game really isn't that hard. i can beat most people at the club without trying. really I think the only thing separating me from Kasparov is just a lot of opening prep and study
~2300 - omg this game is so friggin hard. 2600s are on an entirely different plane, let alone a Kasparov or a Carlsen.
Magnus Carlsen - "Wow, I really have no understanding of chess." - Said without irony after playing some game and going over it with a computer on stream. A fairly frequent happening.