There’s probably not enough competent teachers to teach it.
Enough teachers to teach algebra? Teachers today have the students read the lessons on their computers. Every student is given a computer that they can take home to study the lessons. Then test time comes. Students take the test on the computer. The computer program grades the test, and the results are sent, by the computer, to the parents and students. The children are only given the test grades, They don’t even know what questions they got wrong.
That is how our children are being taught in many schools today.