You can imagine the following perspective: - Most people don't need to learn calculus at all, and it's fine if the few weird students who do start when they get to college (maybe the advanced students can learn single-variable calculus in high school). - For pure signaling reasons, taking calculus in high school has become very important for college admissions. - In order to take calculus in high school, you need to…
Learning to code would have been much harder if I hadn't grasped algebra.
Calculus is important for understanding science (especially physics) and statistics.
These are not niche subjects for "the few weird students." They are really important to grasp for many roles in the knowledge economy. Your kids will enter a world of robotics and automation. They're going to need to use their brains if they want to succeed.
I'm 100% against a dumbing down of the education system to achieve ideological leftwing aims.