there's a place for freenode/gitter/matrix.org's '#programming' room and there's a place for 'correctness of the information repository' that SO provides
you think there is no value in an open question with upsie/downsie on SO? On freenode the answers are very much dependent on the time the question is asked.
Those questions invite lengthy discussion, which SO is totally not optimized for. A software like Reddit (not necessarily Reddit itself) would be more appropriate, in my opinion.
Personally I don't see how Reddit really differs. They both have up/down they both support markdown. SO doesn't have a frontpage or specific subreddits (although it does have tags).