[geoelectric]

IME, you're only really going to immediately get why it's a good idea if you've tried or built the less optimal way first. Otherwise they have to explain the bad way too in order to make their point.

Plus, honestly, you shouldn't be taking their advice as a given. Best practices are always contextual. They're -probably- going to be right, but knowing enough to be critical (even if just quietly, to yourself) is a huge plus.