The rationale is that there can only be so many employees and if natural attrition is low then they’d prefer to re-roll on mediocre performers in an attempt to capture the top ones.
That's a bad rationale. Mediocre performers, are, by definition, average. Unless your hiring process has completely changed, you're not likely to get anyone better if you toss out a mediocre performer and hire someone new: the new person could be better, or could be worse. Moreover, the mediocre person is experienced and productive; the replacement will not be, and probably won't be for a long time. (If the mediocre performer isn't productive, then they're not mediocre unless most of your employees are terrible, and should be fired for bad performance.)
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