Work is often done in teams, even though incentive and reward systems continue to deny that at every opportunity. It is puerile to talk about collaboration while having reward systems that militate against collaboration.
When people work in teams, individual sacrifices lubricate that process; this is often referred to as “taking a bullet for the team”.
The incentive to “take a bullet” was high at a time when job tenure was high and mobility was low: institutional memory existed throughout the team; when someone did the bullet-taking, everyone else remembered when the need arose.
Today, in environments of higher mobility and lower tenure, this is less true. There may be no one left to remember you took a bullet. So it’s important to have a mechanism that replaces the carbon-based memory with silicon-based alternatives.