As far as I think spreading out posts means that we need to write posts regularly and be active at least 5 or 6 days in a week and not just active 2-3 days to complete the weekly quota. If someone is having a quality discussion on certain boards or a limited number of boards, then it should not be a problem as long as they are engaging and worth reading.

That's my take on this but Hhampuz can guide us better.