The FAQ says that Community Wiki works:
by transferring ownership of the post from the original author to the community. They make the post easier to edit and maintain by a wider group of users, but they do not contribute to any user's reputation.
But using the new edit suggestion system, everyone can edit. It's no longer true that community wiki makes a post easier to edit.
Does community wiki still serve a function?
What are good examples of community wiki mode doing what it's supposed to do?