Lately, it seems like a lot of question are the wrong questions - I hate to single one out, but this one, for example. The questions aren't bad, but they are simply things you don't do, or shouldn't do, or need to do because people have gone too far down a bad design or a misconception or whatever. And of course, the user doesn't give motivation for the situation usually.
My concern is that there are tons of answers which are "don't design your database that way" after someone has already got a performance problem with a million rows of data in some screwy schema AND the format of Stack Overflow is not really conducive to collaborative analysis of large problems.
Any discussion going on here about being able to branch answers into a full blown wiki discussion of design issues? - i.e. a fully editable single page discussion of a design.