[wellpast]

What resonates most with me is that traditionally ADTs make the properties second-class citizen to the ADT/class.

First-class properties are strong enough semantics and bundling them together in an ADT is almost always introducing coupling and rigidity with no real benefit.

Why do we need the Person class? Why do we need to taxonomize like that? The answer is we don't. All the Person class brings to the table is straight-jacketing and a false sense of order and security.

[mopierotti]

I haven't watched the full video, but here are some things that a hypothetical Person class brings to the table that you might be missing:

1) A Person class can guarantee that a Person can not exist unless it is fully specified. E.g. you prevent Persons from being created that don't have a date of birth.

2) A Person class provides a syntactically nice place to put pieces of code that rely on the instance fields. E.g. a function like Person(...).computeAge(DateTime.now)

3) A Person class can be a nice place to put inter-field validations. E.g. Maybe you don't want to allow Persons to be constructed if their last name is the same as their first name

4) A Person class can bring clarity to function signatures that depend on it. Basically resolving the problems that Duck-typing introduces