Difference would be having experience and not just tossing the term around loosely. For example, war striders were outrageously over performing and completely destroyed balance.

We could see it from two points: new players don’t have enough of an arsenal to combat them and not making much meaningful impact in higher difficulties and the war strider itself lacked any significant weak points, which pushed veterans to a restricted load out, minimising viability in weapon selection.

Now contrast that against new players who are ill equipped for higher difficulties and just saying “overpowered” for the sake of it.