If the definition of low performer is "really nice, hard-working people", then I suppose you have a point. But it would still suck to be hard-working and be let

If the definition of low performer is "really nice, hard-working people", then I suppose you have a point. But it would still suck to be hard-working and be let go because the company failed to provide you proper tasks to be considered a high performer. If you give a high performer nothing to do, or something outside their expertise, are they still a high performer?