What to do with questions about design reasoning that require an authority?
The C++ chat room started a debate on the open/close state of this question*. Should it be closed as "Not a real question"/"Not constructive"?
Some say "it's hardly answerable- you're talking about one random implementation decision by one random guy, a very long time ago. Ask yourself how many people in the entire world know the answer to that question", and thus it should be closed.
But on the other hand, others held that it is theoretically answerable, even if nobody on Stack Overflow happens to know the answer, and thus it should remain open.
*we eventually decided to close as "too localized," I think.