[stakhanov]

I do agree with the original contention that it's just a proxy for popularity. All of the things that you just mentioned may be factors. But at the end: these factors are probabilities that are mixed together in a nonmonotonic way somehow, and then multiplied by the total number of people out there doing stuff with the langauge. I would expect that that latter aspect is the dominant one in determining the ranking by language.

I would expect advanced people to ask just as many questions as beginners (they just do more advanced stuff, and ask questions relating to more advanced things pertaining to the langauge). Good documentation does not stop people from asking questions, as questions are frequently asked to which "RTFM" is the answer. Schools? Actually pupils asking "do my homework" questions is probably a driver in the opposite direction.