Comment A recent experience (Score 2) 60
Scene: Lunchtime at the Central Market, a trendy/tourist-trappy food-court/market area in downtown Los Angeles. Waiting in line to buy a gourmet sandwich from the sandwich vendor.
In front of the counter: lots of hungry customers. Behind the counter, three bemused-looking sandwich-makers standing idle, because the order-taker at the register is holding a cell-phone to one ear, conversing furiously with the tech support line of the company that provides their cashless ordering system, while at the same time waving off customers because he can't accept their cash and his order-taking tablet's server is down so he can't accept their credit cards either.
My takeaway is that cashless transactions are fine, right up until the moment they suddenly stop working for whatever reason, and at that point everyone involved will either fall back to cash as a work-around, or wish that they could.