You’re correct that they often aren’t, but all the same I find it amusing to read this comment attached to a StackOverflow link where the exact person who suggested “gimme gimme gimme” and the implementer both answered.

Obviously not the ones making the “why are you $X” comments in this case though.

Remember the name of the site that SO replaced, "Experts Exchange".

Obviously it's possible for non-experts to post authoritative-sounding answers on questions that they don't really understand, but I think that is a different category of problem from the "XY-problem" style answers.