Site Bugs / Suggestions[
^] would probably have been a better place to post this, so you ensure that the CP staff see your post. I encourage you to do so.
That said here is my view, I don't see it as a problem, as I those surveys as more way of starting discussions/conversations then to gather any statistics.
I would however see it as a problem if this was possible when voting for articles, tips and solutions, but you have to have confirmed your email before you can vote on an article, and I expect the same goes for tips and solutions.