Okay, now try typing on a smartphone keyboard that animates an enlarged bubble for every key the user taps.
The user thinks 'type, "hello"' and the muscle memory flits between 'h', 'e', 'l', 'l', 'o' with way less space between each letter than the user's reaction time. If they mistype a letter and want to correct it, they'll probably continue for one or two strokes and either navigate back or tap backspace several times.