Fuck AI

I would argue that's actually the last situation you'd want to use an LLM. With numbers like that, nobody's going to review each and every letter with the attention things generated by an untrustworthy agent ought to get. This sounds to me like it calls for a template. Actually, it would be pretty disturbing to hear that letters like that aren't being generated using a template and based on changes in the system.

If you want to sound like a mewling quim they are perfect!

I have some experience on the letter receiving side to share. I have a work colleague who recently decided it was a good idea to answer inquiries in MS Teams or email with LLM generated text. It was very obvious because the wording was too business-polished polite, was too verbose and did not sound like anything you would answer to a colleague ever. While the content was technically fine, the tone was missed by a mile. Also the generous use of the infamous em dash and unnecessary exclamation marks gave it away immediately.

That poses a problem. If you do that to a person you're working with and they immediately know you're serving them AI slop because you're too lazy to be bothered with basic human interaction they WILL be offended. Same goes for customers if they know you personally or expect a human on the other side.

Humans are getting better at identifying AI garbage faster than LLMs improve. Because humans are still excellent at intuitive pattern recognition. Noticing that something is off intuitively is an evolutionary advantage that might save our ass.

Style and tone MIGHT be something they can mimic, but they are phenomenally bad at nuance. The LLM model loses information when it is constructed, and it similarly loses detail when it's asked to elaborate on a point.