Re: With the phone 'switched off'?
Hazardous environments, particularly unlit where a personal HUD with AR could greatly assist. Having helped my neighbors get off our smoke filled corridor in my apartment building, I can honestly say it'd have been nice to know which way was up let alone feeling for door handles to find the exits.
True it's once in 50+ years as I'm not a firefighter and the sprinkler systems would have likely been a tad unkind to the glam mask. But there undeniably are some "killer" use cases, just not sure how lucrative or abundant they may be.