And we could go on for ours as to why we don't need one.
In the end, we would end up with a board full of unfinished missions that noone would ever touch (or if they did, it would be very small numbers), and hence at 50Kb per post (at least) we end up with a lot of wasted space.
This idea has been mentioned and declined previously for the same reasons.
But thanks for the suggestion. They're always welcome.