Article author here. To me the big advantage of Protocols as opposed to ABCs, is that you don't have to have your classes implement a special base class and can

Article author here. To me the big advantage of Protocols as opposed to ABCs, is that you don't have to have your classes implement a special base class and can instead focus on the _consuming_ code. Using a Protocol for a function parameter works even for passing in objects of classes you don't control.