I take it you don't write a lot of CRUD apps?

You deal with a lot of data that is of only a few simple types, and as I said in my post, interoperability means you can't get too crazy with your class definitions. They need to stay simple or the SYSTEM will become more complicated.

As for a variable never staying a simple type, again, see my example in my previous post. A string id is going to stay a string id and its data and behavior is dictated by being an id to remain supersimple.

I am not against defining new types; I am against defining a new type for every single variable "just because."