I use C structs in the same way. I think it's fine to use classes for this purpose. The problem with classes is that certain people go crazy with inheritance and polymorphism, things which sound smart on paper but almost always lead to horrific unmaintainable code in practice.
This is a good point. Right now Kotlin is my favorite language. By default classes and methods are closed for inheritance, and therefore for polymorphism. I like the way this is the default, but you can override it when/if necessary. It also has data classes, which in my opinion is what most classes should be. I think when a class is not be a good fit for data classes, this is a code smell.
