And not just off-line, but as we learned last week, if us–east-1 is down you have spotty connectivity, not hard down, and your device needs to not cook your users; literally in the case of Sleep8.

We've really hit a strange level of dystopia when your bed doesn't work because a server is down

It was a near real-time messaging application. So not really applicable (other than seeing messages you already received - which could be cached from previous sessions).