One thing that's easy to miss, is that there's a lot of background processing essential for usable E2E that doesn't actually result in a user-visible notificati

One thing that's easy to miss, is that there's a lot of background processing essential for usable E2E that doesn't actually result in a user-visible notification. Much of this involves the local app doing some sort of server interaction in response to a push. This could include responding to a message retry request, uploading new keys, handling receipts, etc.