> I can think of a single advantage: one less thing to carry. This system _adds_ the requirement of carrying a smartphone. This is one _more_ thing to carry no

> I can think of a single advantage: one less thing to carry. This system _adds_ the requirement of carrying a smartphone. This is one _more_ thing to carry not one fewer. > if you ignore all these many disadvantages, one can sort of see an utopic ideal behind it. Yes it is true that if you ignore all the problems in a system, then the system has no perceived problems.