People are different. For the kind of person who's likely to get heavily into math, any infelicities of notation are lower-order problems, that's true.

For other people, the function of math in the school system seems to be mainly to sort them by math ability -- and for that, artificial barriers aren't a problem. So there's little demand for better UX design for nonspecialists. Sucks if you think society would be better off if more people appreciated/understood/applied more math.