I think at the end it goes down to a very pragmatical reason: specific brainstorm proposals are easier to address just like specific bug reports are easier to address.

I just rated a proposal in Sandbox with a thumbs down just trying to avoid that it leaves Sandbox: http://talk.maemo.org/showpost.php?p...0&postcount=20 I think this could be a policy and we should address the current proposals that are Under Consideration.