Most threads here are in the Questions category, and often result in great demo solutions by experienced users, sometimes with multiple users improving on each other’s demos.
I just had an idea (spurred by Personal website - Snowing City) for a fun and social and useful activity, which would be initiated by one experienced user presenting an idea with an initial effort included as a JSFiddle/CodePen, and explicit requests for suggestions and successive improvements building on the same demo (meaning no hard feelings about others “stealing” and improving the idea/demo within the informal atmosphere of a forum thread).
The goal could, for instance, be to achieve a certain animation or shader effect, and the result of the collaboration would eventually suit the Resources category well. It is similar to questions, but with higher expectations to the efforts of both the original poster and the subsequent posters.
I think it would be fun.