The cavalier attitude toward correctness comes from "relevance".  Much of the truth you have to share isn't relevant to others.  Even to other engineers.  Presenting a simplified story is best in most situations, even if it doesn't cover the nuances.  If they need to know the details, then it's time to talk.<p>A few quick illustrations off the top of my head:<p>* I speak Spanish fluently and was traveling to Honduras with a group of twenty-some other Americans, only one of which had similar competence with the language.  They asked me to give them a quick "Intro to Spanish" course.  I started with a simplied academic view, "I'll start with some simple vocabulary, some verbs, some conjugations of 1st/2nd/3rd-singular/plural forms to give them an idea of how to talk."  I quickly abandoned that, stuck to the "where is the bathroom?" kind of sentences, names of common foods, other words, and a little human-interest history/geography.  That approach worked, they could ask for bananas even if their word ordering and conjugation wasn't perfect.  They would have been bored to tears after two minutes of a formal language presentation.<p>* I was working at a startup and a cute phone-sales rep wanted to know more about our product so she could sell it better.  She enjoyed biking too.  Great, we go on some great bike rides, I try to educate her about our product but went into way too much depth.  Her eyes kind of glaze over, I'm really disappointed about her lack of interest in the product.  "You really need to know this," I tried to explain.  She probably didn't.  She just needed the talking bullet points.  She wasn't interested the engineering world view of things and I couldn't deal with that.  I saw some disturbing rigid tendencies in myself too.  The friendly relationship kind of stopped at that point.<p>* The best support person I've ever worked with was a master at glossing over the truth, in a good way.  He'd talk to us engineers, we'd tell him exactly what was going on and how we needed to change a configuration or fix a bug or apply a patch.  What he told the customer often had nothing to do with what we'd tell him.  And we and the customers really were better for it.  Either the explanation was too detailed for the customer to follow it, or would alarm the customer and bring up a whole bunch of questions they really didn't need to be asking.  That's wisdom, of a sort, at least.