Every high school should have a calculus teacher. That doesn't mean that all graduating students will know calculus when they leave.

And at least since 1990, every high school should now have a computer science teacher.

It's not so much that everyone should learn to code, but that everyone should be able to have enough of an introduction to it that they will then know whether they need to learn the rest of it or not. Even if they don't, they will still have a better idea about what it entails, and technology will be less arcane magic and more like something that anybody could learn if they had the time and motivation.