I think my question is what would you be doing here that doesn't boil down to "has these properties/methods, I'll accept"? I think this is a lot easier if you

I think my question is what would you be doing here that doesn't boil down to "has these properties/methods, I'll accept"? I think this is a lot easier if you exclude the "methods" in my quote there. Since those almost certainly have the same general contract that would spread across things.