osu isn't math. it doesn't take any progression of prior knowledge. you just stare at the screen, see circles show up, and click on them.But you need basics, such as your reaction stimuli, hand coordination, music sense , stamina , concentration. It's not as simple as 'clicking circles'
Let's take an another example : RPG Games didn't gave you much exp if you beat a monster that it's level are waaayyy higher than yours. It's implying that by rushing you get nothing.