It’s not a tech support forum in the same way as stackexchange IMO. As I said in an earlier post, our focus is also on educating each other and encouraging usage and participation in FOSS. Downvoting does not fit this aspect of community development.
I think of it differently. A downvote says nothing at all about why the post “wasnt good”. It is much better to post explaining why a certain post " So, we’re not discouraging disagreement, we’re encouraging discussion which really is the foundation of a FOSS community (a community in general).
Our conversation here is a great example of this—if you or I simply downvote each others posts, we never discuss the way forward