the whole purpose is the same as the “new math” in the 60s.
It it make it so that parents can’t help the students.
I remember back in the sixties or early seventies when one of my younger sisters was asking me about helping her solve a math problem. She had been learning the "new math" and using something called "base 10" or something I couldn't understand. I asked why she just didn't multiply or divide the way I had learned i.e. the old way. She said she had to use "base 10" or whatever.
My sister actually had the smartest math brain of all my siblings, so she did well in the class. But I wonder about other students whose brains were muddled by the newfangled methods.