I do not like the idea of the picking store, not at all.
I could be wrong (I do not think) but, remember:
- humans make mistakes, machines typically don't.
- everything that involves machines is usually (will be "always" in the future) logged in their systems, anything.
This means that may track everything you do/interact with the machine, store data and use to improve their services, and if something gets wrong the probability of getting linked at the event may be higher then the current system carrier-based since in the latter, there are more entities involves which means more aleatory variable from the company to consider, which make us live easier.
If we find a bug on the machine, this is another thing, we could exploit it, but it won't be easy to find it.