I agree... and if every question that is also on topic on an area51/other SE site would automatically be off topic on Superuser, we'd better close the whole damn site.
All Ubuntu/Apple or Android syncing/Unix/Linux questions should then be closed as off topic on Superuser...
A quick count from the Superuser homepage reveals that at least 14 currently featured questions should be closed off topic.
Furthermore, should we even close question as off topic when they are on topic on Superuser but an in beta SE site on the topic is online? Especially since I don't see an in beta SE site as fully operational. (careful: "worthy")