Good documentation is one of the most underrated productivity tools in IT. It improves onboarding, shortens incident response time, and reduces the number of decisions that need to be rediscovered from scratch.
The strongest documentation is rarely the most verbose. It is structured around the moments where a person needs help: understanding architecture, performing routine work, recovering from failure, or learning the intent behind a decision.
This is why documentation should be treated as a design problem. A page that answers the right question at the right moment is more valuable than a large archive of loosely organized notes.
There is also an important continuity here. Teams change, software evolves, and context fades. Documentation is one of the main ways technical organizations preserve memory without depending on a few overburdened people to carry everything in their heads.