It's false dichotomy that you either get it or you don't. People will access things according to their ability. Where to draw the line on being inclusive? If some has genuine curiosity and motivation to ask a question and learn, then providing a few lines of overview doesn't clutter the board much and can be a positive contribution.
Exactly, where to draw a line? Explaining a concept of abstract and virtual machines may take a few pages of a dense text, explaining how to parse expressions with precedence may require dozens of pages, explaining C types will add a few more.
So, yes, it's either you're curious enough to dig into a code and find the relevant explanations somewhere else (the said Dragon Book and alike), or you won't get it, regardless of how comprehensive comments are.
