Who'd assume that though? Reading through a book does not give me a robust understanding of a subject. If that were true, why would people go to school? I read

Who'd assume that though? Reading through a book does not give me a robust understanding of a subject. If that were true, why would people go to school? I read for a perspective and some entertainment, and maybe retaining some details. I read the God Delusion, but I wouldn't presume to know all that much about the intricacies of evolutionary biology. I have at most a cursory understanding of how natural selection works, and a few examples to go on that I didn't know about previously. Why would I care to know everything about "American air doctrine in WWII" when I hadn't previously paid the subject any thought at any level?