>> Never mind that no real coder EVER writes programs with that particular discipline once they get out of diapers...
This line appears to be a snide remark at class-based OOP, for which a regular criticism is that real-world projects rarely slot neatly into the sort of "Cow is-a Mammal is-a Animal" taxonomical hierarchy that is used to teach class-based OOP in school. Rust doesn't have classes or taxonomical hierarchies, and encourages struct-first POD design (similar to C), augmented by traits which provide shallow has-a relationships (composition) rather than deep is-a relationships (inheritance).
This line appears to be a snide remark at class-based OOP, for which a regular criticism is that real-world projects rarely slot neatly into the sort of "Cow is-a Mammal is-a Animal" taxonomical hierarchy that is used to teach class-based OOP in school. Rust doesn't have classes or taxonomical hierarchies, and encourages struct-first POD design (similar to C), augmented by traits which provide shallow has-a relationships (composition) rather than deep is-a relationships (inheritance).