If you're not a lazy thinker, and you need to know how water gets to your faucet, you'll learn. That's the point of being non-lazy: not that you know everything, but that when you need to know something you take the steps to find out instead of taking some lazy way out (e.g. assuming that because you know one technical area well enough for many of your hunches about it to turn out to be correct, your hunches in other areas are correct).

So you've phrased your reply as an objection, but all I see is an elaboration of the excuses people tell (or act upon) for being intellectually lazy.