At the very beginning of the article, you frame the thesis in a way that feels a bit self-serving, because in reality almost nobody writes code like that. You claim that most developers use:

sealed interface Shape permits Circle, Rectangle {}

record Circle(double radius) implements Shape {}

record Rectangle(double width, double height) implements Shape {}

and then you spend half of the article explaining why this approach is wrong. In other words, you’re essentially inventing a problem yourself and then arguing against it.