However, I think it's mostly intended to be helpful in verifying who you are to someone else.
I.E. I have the option to turn on/off items which are available to whomever scans the QR code: My Portrait, License Status (valid vs not), Age, Name, License Number.
So imagine you're a female entering a club with a bouncer at the door. You can have it show him your face and whether you're over 21, without him getting access to your name etc if you don't want him to know that. All his phone sees is that the QR with your face on it resembles you, and that you are indeed over 21. Looks like the QR code changes on the screen about every 1-2 secs so just a screenshot of the QR will turn up invalid.
When I send an email or text, I expect the recipient will get back to me when they have time.
I know right? The whole point of email/text is that it's asynchronous communications. My kids would rather have a toenail pulled than call one of their friends. It's considered _rude_ as it's essentially demanding that the friend respond to you immediately by answering the phone. The underlying context is that the other party will get back to you when they're next able to do so. HOWEVER, I've seen it become warped over the years that I've watched them... they've become slaves to their phones worrying that they're making someone wait on them to return a text. Sooo, so much for asynchronous communications, heh. I turn it down some on my Android phone with "hey google, turn on do not disturb." Only my wife/kids can immediately get through that. Those that matter, know that calling me twice from same number also gets through, or two closely spaced texts also gets through. Occasionally annoying as I work nights/sleep days and stuff sneaks through the "Do Not Disturb". I wake up, and go through my call list / text message list. Proof people now treat texts as only SYNCHRONOUS communication? Finding every other idiot out there texting while driving. People! The whole point of the text is that you can look at your phone and answer it after you get where you're going, not while waiting for the cop to get there to look at the car you just rear-ended. (sorry for the slightly off topic jaunt there) Now to re-teach the kids what asynchronous communication was supposed to originally be.
Economists state their GNP growth projections to the nearest tenth of a percentage point to prove they have a sense of humor. -- Edgar R. Fiedler