[mattbrewsbytes]

A slightly different viewpoint is that sharing in public or larger private channels allows for knowledge sharing and collaboration. Sometimes the key person is wrong because they aren't the only one working on something. I know that ego might get in people's way sometimes but other people in the team and in the organization also have valid perspectives. As a manager, its important to try and get to a best solution and that means collaboration, not a specific person's approach all the time.

The redundancy also helps the key person be able to disconnect when on vacation. If you are the sole knowledge base for some critical part of the company, might as well drag the work laptop with you every where you go.