This tech is a joke
whether you like it or not and there is no evidence to suggest that tech = inevitable
The problem with this tech is that in retail use there is no redundancy available. if the system is down you need plan B. And once it starts to become more widespread it will fail like every piece of customer operated retail machinery ever introduced. It always ends up back wioth some kind of operator supervision and that kills the whole pint.
If Plan B is robust enough and not greatly more inconvenient than Plan A - well - who needs Plan A.