OK, but she stems from that era where Nokia and others managed to make phones with identical power plugs but with wildly different voltages coming out of the adaptors between brands - in those days that was a very sensible approach.
But, as in the wet monkeys and ladder under a banana experiment, the original cause for this has gone as the quickchargers that DO push out more than 5V like QC2 and QC3 first try to have quiet chat with the receiving end if it can handle it - if no confirmation is forthcoming, 5V it is.
Biting the hand that feeds IT
