Even better when you post a question to stackoverflow and a moderator closes it with "this question should be on xyz.stackexchange.com". You remove your question and post it there just to get another moderator saying "this question should be on stackoverflow".
It's obviously a great site, but as always most moderators are usually people with more spare time than real clue on how to organize things.
"Which site do I submit to" shouldn't be as hard of a problem for certain.
Heck they removed a lot of options from that close reason to minimize this, as anything database related go punted to the DBA one (which is only for professional questions not minor schema questions).
Only problem with the sister sites is that their user base is much smaller than on SO and the value of SO pretty much boils down to "everyone's in there so someone may help me".
It's obviously a great site, but as always most moderators are usually people with more spare time than real clue on how to organize things.