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Re:How to build large-scale end-to-end encrypted group video... by tptacek on Wednesday December 15, 2021 @05:25PM (#29572387)
They can do that, but then when you switch devices, you lose your contact list. That's not what happens with the built-in contact list.

This issue has been rehashed dozens of times on HN before (use the search bar below) and has basically nothing to do with the article.

Re:How to build large-scale end-to-end encrypted group video... by kitkat_new on Wednesday December 15, 2021 @05:38PM (#29572491)
actually, the contact list could include the signal identifiers