I've taken math classes up to Linear Algebra, (so basically what was required for a CS degree) and I still count on my fingers sometimes. In fact I think that math got more intuitive and "mentally pliable" the more abstract it got, but for some reason I'm still pretty hopeless with arithmetic. I also have trouble with telling right from left. Is it really the case that using fingers for arithmetic can hold a person back from learning higher math? Not trying to be snarky, genuinely curious.