I often ask a question on Google, get taken to a Stack Exchange site, and find that yes, they have my question, but some moderator closed it before it got answered. SE got my traffic, but I didn't get my answer. Isn't that broken?
More often, I find a question that is closed and frozen in time that does have answers, because the answerers were faster than the moderators. For instance, "Where can I download Spring?" The top Google result is a StackOverflow page that is closed as off-topic.
http://stackoverflow.com/questions/19124445/how-to-download-...
http://stackoverflow.com/questions/19082860/where-can-i-down...
The question is off-topic, but as you can see it was still answered. Still, to solve that problem, a new site was opened per request of users: Software Recommendations Stack Exchange