I mean, I think the problem is evaluating performance at all for time not spent at work. If someone was on leave for part of a review period, that time shouldn'

I mean, I think the problem is evaluating performance at all for time not spent at work. If someone was on leave for part of a review period, that time shouldn't be evaluated. If they were on leave for most/all of it, that review should probably be skipped as null. Doing otherwise creates a misleading conflation between "meeting the expectation of leave" and "meeting the expectations of the job".