I think part of the problem is that we assume that the obvious truths are obvious to everyone. Many of the texts and reference materials have deleted the fundamental explanations for why we do what we do. Even if we learn later that the methods were based on what 20/20 hindsight tells us are not quite right reasoning, it's still good to know the initial motivation behind the rule.
I've taught other subjects and I've lost count of how many times I've said something referencing X, and been confronted with 20-30 deer in the headlights because I assumed they already knew X coming in.
I think we need to get a little more thorough in the backstory.
Matt
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