> "Doing a handover" won't save a lot of companies. There's no level of "handover" that will save some of the shops I've been in, that just 100% rely on one team member to handle _everything._ Even if they took a _month_ to try to pass along along their accumulated knowledge, there's ingrained engineering practices and processes that all boil down to "Go ask Chris."

That might very well be true, but to a manager having a handover means the problem of loss of institutional knowledge is solved, and any subsequent problem due to lack of context or loss of institutional knowledge is avoidable and caused by poor handovers.