[ip26]

Did micro USB have different keyings for different power levels? No, we just plugged in our device and it charged at the rate the charger could support, and if you needed fast you found a fast charger.

Broadly speaking faster charging and faster speeds are just... faster. The beauty of USB is that you can plug into a billion different chargers around the world, anywhere, and while the charge rates might vary, you can charge up anywhere. Keying breaks that.

[gumby]

There is only one power spec for usb cables before type C. Anything beyond that was a proprietary variant that, yep, wasn’t always obvious upon inspection.

Not defending USB type C here.