http://ciisqbg45nggykdl6rjdrq3wc64csga4vkphu66qsi65mypeitqedoad.onion/blog/wireguard-privacy-concerns
There are probably several ways to subvert it and a host of other subtle bugs. Some people might think that by hiding things from userspace, they actually hide things, but this could not be further from the truth. However, if you simply want to be able to claim to people, "we don't have the ability to view internal or external IP addresses of any peers," and you really do lack the know-how to subvert this, then I suppose it might be somewhat useful.