What is BB's real business value proposition?

I'm got sincere concern for the well-being of Blackberry. I doubt that having a physical keyboard is enough of a game changer to have people switch back to a BB from an Android/iPhone device. They've stagnated for several years while their competitors have moved ahead, in terms of both OS polish and device functionality. A lackluster interview performance where not a single tangible improvement was given seems more indicative of the company as a whole than just an inept executive.

Any speak about "business friendliness" and "security" is complete hogwash. Apple's and Androids MDM solutions may not be perfect, but app-level encryption is readily available on both. Data secured at rest + data secured in transit.