Agree. I find it quite interesting how the concept of classes resp. objects has been adapted and moved away from what they really were let's say in Smalltalk (message processing entities) ... and I think this "progress" was not for better regarding the clarity of the concept.

I think this progress has to do with "type systems" and additionally with the very powerful tools c++ f.e. added to the tool box. The more powerful the toolbox the harder it is to truly grasp it, it seams which steepens the learning curve considerably unless only the very rudimentary "features" of oop are used, as it happens mostly in commercial 9-5 software development.