I know I'm going against the spirit of this hypothetical but the trouble with good technical documentation is it can quickly become bad technical documentation.

I know I'm going against the spirit of this hypothetical but the trouble with good technical documentation is it can quickly become bad technical documentation. It needs constant maintenance over the long term. Every patch that's committed to the code needs to be evaluated for how it impacts the docs. Preferably changes to the docs should be done via a collaboration with the patch author(s) and a documentation expert (aka someone who is good at writing technical documentation and is familiar with the conventions of this specific document).