It is still possible to benefit from automatic generation even when a document is mostly written by hand.
For example, you can use generators to run embedded example code, to verify that the results are what they should be (both on day one, and two years from now when the API has changed). New users have every reason to believe that the examples actually work, and when they don't, their impression of the technology is soured.
For example, you can use generators to run embedded example code, to verify that the results are what they should be (both on day one, and two years from now when the API has changed). New users have every reason to believe that the examples actually work, and when they don't, their impression of the technology is soured.