““tribal knowledge” — information that was passed from older members of the team to new members”
That is the way the old Guild system worked.
Don’t tell anybody but your tribe how to do something to protect your jobs.
It happens today with IT projects. The folks that built it retire. Nobody new knows how to do it that way. Remember the Y2K horror stories and the search for the hold coders?
So they spend buckets o’ money on new tech, with new folks that will be gone in a few years. Rinse. Repeat.
Great for the Tribe. Bad for everybody else.