I think a channel like that would be pretty fun and helpful. Most of the server is very technical and ive sometimes wondered where an appropriate place would be for getting feedback for game mechanics or anything else really that's not technical but still is a problem. Call it something like #Mechanics-Feedback i guess.
As for why i am asking for this, i had an interaction today with a few people in #lounge Where i got the solution to a conceptual problem ive been having and i thought having a dedicated channel would be helpful and a nice addition to the server
Here's a link to that conversation btw