Isn't GMail's new feature is huge privacy hole?

Am I the only one who thinks that GMail's new feature that suggests people to add to an email is a big privacy hole? It suggests people whom both you and the initial recipient have a mutual contacts. Thus, it lets you know people whom others have been emailing, as long as you know them too. I just found out that a friend of mine must have a mutual contact with my old college roommate thanks to GMail's suggestion.

Not sure why no one else has been talking about this.