You need an untethered protocol to support chatbots and other applications. And desktop as a first class device falls out of that. And mobile users benefit too,

You need an untethered protocol to support chatbots and other applications. And desktop as a first class device falls out of that. And mobile users benefit too, now no longer having to distribute their phone number. I feel that they had started with untethered, then Signal would be a lot father along the road to its goals.