It does. It adds certainty. It adds notice. It ensures consistency between the Criminal Code and the common law. I would just point out that, of course, statute is superior to common law, and whereas common law can be revisited on a much lower threshold, statute is accorded a higher regard. For those reasons I think it's really important for Parliament to decide, from time to time, which elements of the common law it agrees with.
You can also make the converse argument, but certainly if it agrees, then I think it is very laudable for Parliament to engage in reflecting those principles in the statute.