The point is, that original proposal was too broad from the start. It should have been rejected by a Brainstorm moderator with a suggestion given to open a new brainstorm with a more narrow focus.

Finding the sweet spot for problem focus in Brainstorm is going to be like picking topics for term papers back in school.

• Propose a topic too narrow, and your teacher will reject it because you'll only get an essay, not a paper, out of it. For us, that's the simple, yay/nay, "Default phone icon should be green, not blue"-type* stuff that belongs in Bugzilla, not Brainstorm.
• At the other extreme, the teacher will also reject proposed term paper topics that are too broad, as you'd just wander aimlessly in that book-sized topic and never achieve a real point in your ten pages. In Brainstorm, that's "Make Maemo suck less"-type* stuff. Sure, widespread improvement is a worthy goal, but it needs to be broken into reasonably-sized chunks. Otherwise, as in this case, it becomes impossible to select a solution, implement it, and mark the brainstorm closed, because there are a dozen or more other, unrelated, but probably equally deserving, solutions hanging on.

* Yes, this is a stupid example. It's early, and I'm hoping it's just good enough that my point is conveyed.