that is totally useless information because the game cannot identify if you were missing because you're timing was off or because you fucked up
you obviously want a number which is measuring your timing issues. not your fuck up issues.
thus the game calculates an average about all your erros. this reduces the impact of fuck ups onto the resulting value, because you have more samples. Also it gives you a much more accurate value.
if taking only the highest and lowest hit accuracy and display it to you, its a fair chance this is the 50 you hit while you were brain afk for a moment.
you know that was bad for yourself. thus you dont need the game to tell you.
edit: sorry for ressurrecting i was searchiing via google^^