When trying to charge a phone from public charging stations and power outlets on airliners, one thing that I’ve noticed is that the USB-A (traditional rectangular) ports tend to be “loose like wizard sleeve”. Unless one is willing to hold the connector and apply pressure, therefore, they are useless for charging. I’m not sure how they get like this. I can’t remember a USB-A connector failing mechanically on a home computer or charger. Is it just that if 1,000 different cables have been plugged over a one- or two-year period that the socket is stretched out to the size of the largest? Compare to at home where I might use only three or four different cables in any given socket.
What’s the prognosis for USB-C? Are the tolerances more precise such that the public connectors will remain functional?