I would have agreed with this argument, but only if it was titled When Snark Works.
Flippancy works best for people who already agree with you in principle. Jokes and references have to be gotten; irony and sarcasm need to be picked up. They’re fun when they’re for you. The earnest, thorough stuff, on the other hand, has to waste its fun doing the boring work of reaching out to all possible listeners—explaining where it’s coming from, inserting caveats, acknowledging exceptions and counter-arguments, etc. It builds a case; flippancy gets to just dance entertainingly on a case. One is the way you talk to people who get you, the other is the way you explain yourself to people who don’t.