Re: Fast-charging
Quote: "I still don't understand how a single charger would resolve the differences in fast-charging specs."
The issue is the different charging specs, those need to be scrapped, as they are not part of USB (they are proprietary add ons).
USB C already has a defined standard for high voltage/current charging, so other companies using their own is just making things worse. Companies like Qualcomm and OnePlus should be adopting the USB standard, not doing things their own way.
I own a OnePlus, and it does have very good rapid charging, but I can only rapid charge with their power brick, and their cable, (it needs both). They will charge other USB devices (i.e. the socket on the PSU is a standard USB A), but only at a standard charge rate.
Also, use any other USB charger, or any other cable, with the OnePlus, and it's also back to standard charging rates, even though the PSU and cable could supply high speed charging to a compatible USB C device (such as a laptop).
What I'd like to see is a rule stating if you (the manufacturer) want to use USB for charging, and want to claim any form of rapid charging, then you must support the USB standard for doing this. (They can still do their own thing as well if they wanted to, but that needs to be alongside fast charging as per the USB spec).
From what I've read, Dash charging (what OnePlus uses), allows up to 55W (11v @ 5A), whereas USB-C charging allows up to 60W or 100W depending on cable size (standard USB cable is 20v @ 3A, thicker USB cable is 20v @ 5A), so there really is no need for other non USB standard rapid charging methods over USB.