Pondering Foreverbull's point here, about whether snark is necessary. It's hard to answer that question, but a related question is: What is the function of snark? Can it add anything meaningful to a message, that can't be conveyed by the information alone?
I think that snark is actually one way to convey feeling offended. It can communicate, "The content of your question and/or the way you are asking it is offensive to me." I can entertain that this could have value, in cases where posters are being persistently impervious to feedback. Because there is a difference between asking reasonable questions that a newbie wouldn't be expected to know about, and stubbornly arguing against the consensus of experts that, e.g., you are the chosen one who can take shortcuts to a high-level career with no consequences. (To be clear I am NOT referencing anyone in particular with that characterization; it's just a common bogeyman that we get defensive about.) Out in real life, people with actual power over students' futures may be put off by it, but are less likely to respond in a transparent way. So is it potentially valuable info for students to get that feedback online, so they know when they're toeing that line of actually being off-putting to others?
That still wouldn't mean that it's necessary per se, I'm just wondering if it has any potential value at all.
Of course the flip side is that 1) Snark can also serve a function of just blowing off steam or boosting the ego of the poster, which I don't think is helpful to other posters, and 2) If we are too quick to dish out the snark then we're sending the message that reasonable questions/explorations are offensive, which I think is very counterproductive.
And finally, I am now kicking myself for not naming myself SansaSnark.