I'd say I generally agree with this sentiment, but it's important to first build the proper rapport with the recipient. If you show them kindness and respect outside the bounds of technical conversations, they'll be much more likely to assume the best of you when you communicate straight-forwardly over technical matters.

You also should take care to avoid crossing the line into just being a jerk. This type of thinking is also often used by people who are simply arrogant and rude and are patting themselves on the back for being that way in the name of "directness" or "efficiency".