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.
If you're always chasing the next technicality then maybe you didn't really know what question you were looking to answer at the onset.
This sounds like someone who has never studied physics.
"Oh wow, I figured out everything about physics... except this one little weird thing here"
[A lifetime of chasing why that one little weird thing occurs]
"I know nothing about physics, I am but a mote in an endless void"
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Strong or weak definitions don't save you here, what you are looking for is error bars and acceptable ranges.
If you think I'm saying that the world is not infinitely complex, you are missing the point.