I try to capture data in a enum or struct, then define the operations available to that type. A trait allows me to capture common functionality across different types which implement that trait. With generics it allows me to be polymorphic.

If that’s not OO, I don’t know what is :)

Well, technically traits dispatch based on type and not on value. As long as you aren't wrapping everything into trait objects that is much closer to functional programming. Seems like a mostly semantical difference, though.

I guess there is a philosophical difference in whether you pass a large struct into a function or select the needed data at the call side and only pass that, though. Former might be easier to extend, latter is probably easier to test?