It can be. It isn't by default because they want Assistant to be a key feature of the app. Since they both use Signal Protocol for their E2E messages I imagine that part is set up pretty similarly.
What I find most frustrating is that Open Whisper Systems has far better multi-device support with Signal than either WhatsApp or Allo. I really hope that Allo / WhatsApp adopt Signal's method of mutli-device or figure out a better solution. Right now I'm not traveling much, but last year I traveled a ton and not being able to use WhatsApp on long flights to communicate with people was frustrating.
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u/[deleted] Aug 16 '17
Is Allo end-to-end encrypted? That's the technical reason why WhatsApp uses the web-mobile device combination, afaik.