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  • I know where you are coming from, but I don't believe that your last statement is a fair representation of the situation. Yes, both interfaces deal with the view, but the concepts they represent are totally orthogonal. So I would restate it as A class, or base class, implementing multiple un-related blocks of code is a bad design, because putting all the code in the one base class intertwines it and you now rely on the good graces of the coder not to screw up and change one interface implementation when he meant to change the other. Commented Nov 9, 2017 at 14:37