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I'm not sure I'd classify Windows as changing dramatically in its implementation, and the cost of maintaining binary backward compatibility has been considerable. Only a company the size of Microsoft could afford to do it year after year.

There's also a difference between building good software and building profitable or even popular software. Sometimes bad design can even help maintain a product's market lead, as if a design is complex, it's hard for competition to make compatible products.

You're also still confusing abstraction and encapsulation. An API can be an abstraction over a lower-level system without being an example of encapsulation.




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