The only discoverability I have seen work in Sharepoint, is the person who wrote something linking the document directly to a person in a pm.
(Denying, through non-discoverability, haphazard access controls, buggy application behavior, and often simply being deleted.)
And that's not my only major objection to the current Microsoft dysfunctional-company software suite. I just realized I'm clenching my teeth, from recalling how harmful that load of shit was, the last time I saw it crippling employee effectiveness.
Turns out it doesn't matter how many security trainings we make them go through.
Then no amount of practice would make any difference?
In the rest of professions, the reward is to keep their job and business, when compliance isn't ignored.