Except there are people who are extremely good at passive-aggressively dragging their feet specifically such that it's hard to quantify. Metrics are entirely gameable and people know this. In development, this could be the guy who always somehow grabs the easy tickets then says "Hey I closed like 3 tickets yesterday I'm performing." Or he consistently overestimates his stuff - how much time should a busy manager spend assigning everyone's story points just in case they have to build a case to fire someone later?
There are also people who are technically performing but in practice but are jerks. And please don't start with "that's what HR is for" because I have never - not once - seen HR solve, or even significantly help, this sort of problem. Plus everybody hates dealing with them.
Just let people fire lousy workers man. This isn't that hard. Or, employees should push for employment contracts where the commitment is reciprocal: employers promise to keep them on for a few years and they promise to stay on for a few years.
There are also people who are technically performing but in practice but are jerks. And please don't start with "that's what HR is for" because I have never - not once - seen HR solve, or even significantly help, this sort of problem. Plus everybody hates dealing with them.
Just let people fire lousy workers man. This isn't that hard. Or, employees should push for employment contracts where the commitment is reciprocal: employers promise to keep them on for a few years and they promise to stay on for a few years.