I think what you mean is to separate implementation of interfaces from the implementation of attributes they manipulate. Yes, that's a good idea. However, it's too blurry a line in my opinion, so is not something the language can enforce. Rather, it's the framework designer's homework. The model-view-controller paradigm fever mentioned seems indeed to be what you're after. In fact, I consider the MVC approach almost the sole raison d' être for OO as a paradigm equal to functional or logical programming.

Makeshifts last the longest.