> With restructures everywhere, should I hold on to the knowledge only I have? > > A question I am asked on most calls

The opposite. If a business cannot move you without a problem, it will not move you, and that includes upwards. Make yourself replaceable: document what only you know, train the person below you, and hand things over cleanly. It is the people who can be released from their current seat who get offered the next one.

In a restructure, the person who has made their team stronger is a much easier case to keep than the person who is a single point of failure.