why are people still okay with using 'milliamp hours' for portable device batteries???

it says fuck all about the actual battery capacity; are we talking 3 volts? 12 volts? 0.1 volts?

you don't talk about chargers in Amps either, because that also doesn't say anything "4 amps" at 5V is 20W and at 20V is 80W.

so it absolutely drives me bonkers when people say "you can charge with 90W and it has a 7100mAh battery!"

because that battery could be 21Wh (3V) or 90Wh (12V)