Most American organizations write to a style guide, whether a published standard or an internal document. Generated text does not follow one, and reconciling it is where the time goes.
Style rules are arbitrary by design
A style guide exists to make consistent choices among options that are all defensible, such as whether to use a serial comma or how to render numbers and titles.
Because the choices are arbitrary, they cannot be inferred from general English usage. A model produces whatever was most common in its training material.
The result is text that is correct by ordinary standards and wrong by the organization's, which is the hardest kind of error to catch quickly.
Terminology carries the highest cost
Organizations maintain controlled vocabulary: the exact product names, the approved description of a service, the terms legal has cleared and the terms it has prohibited.
Generated text substitutes synonyms freely, because synonyms are usually good writing. Here they create inconsistency across documents and sometimes a claim the company does not make.
Regulated sectors go further, with required phrasing for disclosures and prohibited comparative claims. Those are compliance requirements rather than preferences.
Violations are distributed rather than concentrated
A structural problem appears once and is fixed once. Style violations appear throughout, a few per paragraph, each individually trivial.
Fixing them requires reading every line, which is the expensive part of editing. A draft that arrives ninety percent right in style terms still needs a complete pass.
Supplying the guide only partly works
Including style rules in the prompt improves compliance on the rules stated explicitly and does little for the rest of a long guide.
Practical setups extract the dozen rules the organization violates most and enforce them in the prompt, leaving the remainder to automated checking.
Deterministic tools handle much of this better than the model does, since terminology and spelling rules are exactly what a checker was built to enforce.
The workflow that holds up puts style last
Teams that succeed treat generation as producing structure and argument, then apply style as a separate mechanical pass with a checker and a human read.
Attempting both at once produces text that satisfies neither, because style instructions compete with substantive ones for the model's attention.
Separating them also makes the cost visible, which is what allows a team to judge honestly whether the drafting assistance is worth the editing it creates.