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I'm sort of watching the answers to this question myself, to see what other people have to say, but I will say three things that I'm inclined to think about this:

1. People put way too much faith into interfaces, and too little faith into classes.

2. There is nothing wrong at all with overriding a method, calling super.method() within it, and letting the rest of its body just do things that don't interfere with the base class.

3. As a rule of thumb, being this rigid and dogmatic in software engineering is a bad idea, even if something generally is a best practice.

So I would take what was said with a grain of salt.