The problem is not the content, but the delivery. A good teacher can teach quantum mechanics to an 8-th grader. A bad teacher can't teach even the most basic things without making students hate theose subjects for life.
Algebra is not useful to balance your house budget, it is useful to develop abstract reasoning. Good luck surviving in the next few decades without any abstract thinking skills.
The problem is not the content, but the delivery. A good teacher can teach quantum mechanics to an 8-th grader. A bad teacher can't teach even the most basic things without making students hate theose subjects for life.
Algebra is not useful to balance your house budget, it is useful to develop abstract reasoning. Good luck surviving in the next few decades without any abstract thinking skills.