To claim that "all questions are already answered" is super arrogant. Then they could at least do the courtesy of linking to the already answered question. Granted, they do this sometimes, but not always.

Anyway, it's simply not true that "all questions are answered." Often when I've read the answer for a purportedly same question, the nuances of the other question is often nowhere near the original one, leading you to never fully having your question answered, which is extremely frustrating.

Often what you're looking for is simply a new way to explain an old concept, so that you better learn the inner workings of the problem. People are different, and so different people need different explanations. This is basic pedagogy. And that's also why RTFM does not work for all people. To think so is so arrogant that I'm at a loss for words.