It's not 1% of the work. If you have ever written public documentation, or half-decent internal documentation that is understandable to people outside your team

It's not 1% of the work. If you have ever written public documentation, or half-decent internal documentation that is understandable to people outside your team, you would know that it takes a lot of effort to get it right. Let alone something highly technical like this. If you get things wrong or skip things you think are trivial but not to others, you get more questions. And it is not a one-time thing, it is a living document that needs to be updated and revised over time.