2. The demo on the keynote gave a great use case where a school nurse called the speaker about their child, and she was very lucky to pick up and not let it go to voicemail.
There are still a lot of use cases for calls to hammer out important details, even if they are becoming rarer, like health or car maintenance, or places where sms is associated more with spam. This is a great way to get the best of both worlds, even if it's technically during the decline of calls.