We have several tools to gather feedback from the people.

Forum, Brainstorm, Bugzilla, Mailing lists

Each of them has its own scope. We just need to figure out better which one serves better for that particular purpose.

From what I see them, forum and ML mostly overlap, it's just a matter of preferences of where you want to share your thoughts on a particular topic.

Bugzilla is clearly the tool for bugs and (to me) for small enhancements to already developed tools.

Brainstorm is the tool to propose brand new ideas. It clearly overlaps a bit with Bugzilla Enhancements but we can live with that and use common sense to move enhancements between the two.
For example I have proposed a different zoom gesture. It could have been filed in as a browser enhancement, but it clearly (to me at least ) belongs to Brainstorm as the gesture should be made available to all applications.

So yes, I think we need all of them, but we need to clearly state their purposes on a wiki page so that the boundaries between them are better defined.