Follow-up to my post on what gets lost when seniors retire: what have you actually seen work, and what died?

A few weeks back I posted here asking what gets lost when senior operators retire. Your replies taught me more than months of reading on my own. Two things that stuck: the day-to-day is easy, it's the once-in-10-years event where one person's memory is the only thing that saves you. And a lot of you said whether any of it gets captured really comes down to leadership.

What I still can't see from the outside is what actually works. So two questions:

1. Any attempt you've seen to capture or hand down this kind of knowledge (a binder, an SOP, a shadowing setup, a "tips and tricks" folder, anything, any tech), did it stick or did it die? What killed it?

2. For the ones that died, what would you have changed so people actually used it? Even what it should have looked like.

Trying to learn from what's failed. Any war stories welcome.