[hardwarescope]

As a consequence of this choice, they store all of your unencrypted contacts (or unencrypted Wire contacts) on their servers. I don't think that's "additional privacy," compared to what Signal stores (nothing, it appears). Or it is at least not as simple a question as you make it seem.

[walterbell]

Would appreciate a reference on this, if you have one. I don't know about the general case, but none of my mobile contacts are shared with Wire's server and most of my Wire contacts have pseudonym handles/names.

If IETF efforts to standardize E2E messaging protocols can lead to interoperability between clients, we can reduce the influence of social network inertia on messenger client selection.