They may know everything about you right now. But they don’t know about your future self, how you can change, how you may be an entirely different person in as little as a year. Data is useful, but it is more useful the more updated and recent it is.
I think the reason “new math” gets flack, is because it’s a new way of teaching math, and alot of teachers aren’t as good at teaching in that way yet. Still, kids should be taught that it can be a way one does calculations. Another thing I think should be incorporated into early childhood education is the use of an abacus, the Japanese do this and it supposedly helps greatly with mental math.