Every HR process depends on someone remembering how it goes
The HR generalist who knew exactly how to run a probation review, a flexible working request, or a sensitive exit conversation has moved on. The person doing it now is piecing it together from old emails, a documentation page that's half-finished, and a quick Teams call with someone in the wider team who "thinks they remember how it used to work."
Every HR process is documented as a flowchart and SOP that captures the actual steps, the actual scripts, the actual forms. Institutional knowledge stops walking out the door with the person who held it.