Be nice to each other, or else 
, right? 
It sounds like people won't be actively discouraged from asking/answering questions that could potentially go on SO, which I'm glad to hear. There have been highly informative discussions created by reasonably straightforward questions that could have been answered on SO (like Extract single list element as part of a “pipeline”).
There may be a point where we'll start getting questions that, if they started a discussion, would essentially be a repeat of earlier discussions. That's not an issue now, and readily dealt with by linking to earlier threads once it starts happening.