I don't think mentioning the quality of the public schools is relevant. Poor people are almost always stuck in public schools (on occasion they can get aid for private schools). This rule on banning certain math classes applies to all public schools regardless of how good or bad they are. This means even if a poor kid went to the best public school in the world, they would still be impacted.
I have met teachers who would go out of their ways in helping the students to learn. My teachers from many years ago were like this. That's the perk of the good ones. But other than that, I agree with you
You think the resourceful parents are just gonna sit on their hands and thinking: oops the school is not gonna teach the subjects, we are just gonna to collectively forget out them.
No. They will do whatever they can to make sure their children get the education. They will pay extra. Some will teach their children themselves.
Again, this is regardless of race/religion/lgbtq or anything. It's all hands on deck when it comes to providing for the children.
Sometimes I really doubt whether people are really that naive online? Or are they arguing for the sake of the argument? Tbh, I have never seen anyone in real life doesn't understand the situation and the parents that I am talking about.