For me it’s time signatures in music. I grew up playing instruments, played in several orchestras, etc. But no matter how many times someone tries to explain time signatures to me, it makes no sense. I don’t understand why people place such importance on it. To me, notes have a pitch and a duration, maybe some dynamics. That’s it. I don’t understand why people try to needlessly complicate it. It doesn’t give you anything.
My wife will hear a song and go “Oh neat, it’s in 5/8.” And I’m like “How tf do you know that, and why does it matter?”
Just to chime in, I’d say I have very high propioception, but I have a hard time getting my head out of the way of my body. So I will do weird things like drop a spatula but catch it before it falls a foot because I’m thinking through the process of holding the spatula, and fumble it, but when it falls I’m just thinking “catch the spatula” and do it spectacularly. So I was also a clumsy child, and have the scars to prove it, but mostly because I was thinking about everything I was doing.