Because it's harder to correct subtle errors from an ad-lib generator than it is to construct a correct analysis in the first instance.

Agreed but there is safe(er) way to use it that large addresses that concern:

First construct your correct analysis through conventional means, untainted by machine hallucinations. Then have the machine generate a result and see if it caught anything you missed, and carefully check whatever few parts you incorporate from it.

This is not different than having a lesser expert check your document (e.g. THE CLIENT!), except the machine time is very close to free and may be even better at catching far off concepts.