That's because Smalltalk's real invention was the term "object oriented". The C++/Java/C# family of objects favoring encapsulation and interfaces started with

That's because Smalltalk's real invention was the term "object oriented". The C++/Java/C# family of objects favoring encapsulation and interfaces started with Simula 67 before Smalltalk. It's actually amazing how much Simula looks like a modern object language, for example it has a direct analog to Java's inner class. Not much has really changed in terms of concepts. The story of Smalltalk is really a story about marketing: it's a simple and pretty model that's easy to tell so people lionize it. The reality is that almost all successful object languages used in industry are based on the Simula model not Smalltalk.