That's a valid point because that how battery meters work... or gas gauges work... Does your phone tell you how many hours of screen time it has left to the battery? NO....
many phones do, and same goes for laptops
in the same way that many cars now will give you a "distance til empty" readout. theres nothing wrong with the principle - its just simple math - and its up to each person to decide which they prefer to see
but anyway im in camp Percentage. i know what my conversion rate is (current 3-4km per percentage, depending on aggressiveness of driving), and also know where to access the computer's rate is and off what basis