Based on what I read from the thread, it's more the case that the Docs team is using it to get the pulse of what people want from Google Docs, than necessarily promoting anything. (Or even directly answering certain questions.)

The top questions right now are on offline, security of Docs, outlook for mobile app, formatting problems, only some of which I'm personally concerned about. So I'm hopeful reddit feedback works its way into prioritization and product plans.