Why the strong push for this?
Because there’s no middleman! 
The reason the internet is inherently insecure at its foundation is that the connection between points is essentially based on carriers… Almost every link can be compromised.
This application… without Wi-Fi, and even after removing the SIM card, by turning on Bluetooth, you can exchange messages within a limited physical range…
Oh, applications of this type weren’t new before, but the one who cooked up this code this time… is Jack Dorsey, who previously cooked up Twitter…