> It is universal common knowledge that the ease with which one takes to math is different for different people. Why can't we just admit it and quit trying to make people who are unique the same?

I disagree with this statement, especially at the level of arithmetic and basic algebra. While math "ability" is likely a bell curve I would wager that it is centered well above Algebra I, and whether a kid at that age is "Good" or "Bad" at math is much more mindset/perception.