Earlier quoted context omitted.
Cash is a superior technology for security -> Huh? The bullet proof glass cage protecting the cashiers is the “technology”.
The problem of space of physically securing cash is more stable over time and better understood by non experts than the problem space of securing electronic payments: For example, the costs and benefits of "There is a new innovation in theft, people yank ATMs out of walls with trucks, which you can mitigate by putting up bollards" are easier to understand than "there is a buffer overflow in your logging software that…
(And to add a cherry on top, this is usually not disturbing to actual customers, because they're busy doing usual bullshit paperwork while the safe is unlocking.)