Never worked at Apple specifically, but every place I've worked had little to no docs on internal tools. The expectation was that you'd go ask the person who w

Never worked at Apple specifically, but every place I've worked had little to no docs on internal tools. The expectation was that you'd go ask the person who wrote it, or absorb the tribal knowledge as part of on-boarding. There was even low-level resistance to folks who tried to document the ambient knowledge to help out new employees. Also, keep in mind, in the timeframe that is relevant here, the only apps were Mail and Safari. Apple making Mail a native app from the start was another tell that "you should just build web apps" was disingenuous.