Sure, but we certainly mean something by them. When you or I say "RPG" we generally know we don't mean Monopoly and know also that the hearer won't understand us to mean Monopoly. So while an inclusive definition might be useful, a definition that is so inclusive as to be meaningless isn't useful.
In this case, "inclusive" isn't about allowing Monopoly in. It is about the nature of the definition.
In an exclusive definition, the heuristic is of the form, "If you do not meet some litmus test(s), you are OUT, no matter what your other characteristics might be."
In an inclusive definition, the heuristic is of the form, "If you have enough of these characteristics, you are IN, no matter what your other characteristics might be."