I couldn't agree more.
I see no harm at all in allowing every member to see the forum, and, indeed, it would make us happy
Also, making it visible would allow people that are curious to just statisfy that curiosity, while they won't need to be 'developer'. The danger exists that people would enlist themselves as developer just to see the progress (and possibly whine about it). Allowing the board to be seen by either everyone, or a 'spectator' group, would solve that problem.