> some formulaic letter, complete with all the required phatic flourishes
Why do you think that person reading your letter requires those phatic flourishes? Culturally I believe they serve as a form of proof-of-work: The effort is the point.
Written by an LLM, it becomes truluy valueless slop. Just don't generate the slop in the first place.
> I'd you're actually plowing though that slop yourself, you have only yourself to blame.
What a way to react to someone sincerely reading what you wrote them.