[mgkimsal]

> it depends on what the subject is and who the person is

bingo.

> because years later some new joiners would read it and think something I wrote in 15mins in a workshop 6 years ago still represented who I was at the present time.

As with any other documentation, you need to spend time keeping it up to date. If you'd upgraded some libraries and added new ones, but still had docs you gave to new team members referencing the outdated libraries... how productive could they possibly be?