> If a Q/A site allowed basic questions then the site would be flooded with them since the population of novices greatly exceeds sophomores or experts.

This is really excusing bad UI/UX (like surfacing existing answers while a user is typing a question) and a bad ranking algorithm. There is no such thing as "being flooded" only bad search algorithms, and bad UX. Google is "flooded" with a result set spanning the entire internet, and they manage to surface answers. Stack Overflow can do the same--they have more tools to rank and influence behavior (rewards, moderation, points) than google has because they control the site, its structure, and how it is gamified.