From a tech perspective, e2e adds a lot of constraints on reliability and message ordering which makes it hard to distribute (think « exactly once » vs « at lea

From a tech perspective, e2e adds a lot of constraints on reliability and message ordering which makes it hard to distribute (think « exactly once » vs « at least once » kind of problem, albeit a little different). It also adds a lot of UX problems, since every device has its own secrets and version of the messages. This is, imho what makes whatsapp uniquely hard to scale.