No, it does. In some cases (think dictatorship) - you not only want the secret police to not read your messages - you don't want them to know at all, who are you talking to(and how often and when!).
Otherwise you might all go to jail (or worse), if they are after one contact of yours. And then you can try to feel save, that they don't know your encryption password.
https://xkcd.com/538/