I believe OP is saying that 80/90% or whatever should be displayed as 100% to the user, the same way fuel gauges in ICE vehicles typically leave a large amount of fuel in the tank while displaying as "empty".
This is mainly a U.S. practice, as many European countries like their gauges to be as accurate as possible.
This is mainly a U.S. practice, as many European countries like their gauges to be as accurate as possible.