The issue is that correspondence is legally enforceable [0]. LLM's are good and getting better, but if LLMs are giving enforceable undertakings, you want to very sure they are not going to promise something that will send the company broke.

I'm not sure what risk a businessman is willing to accept, but I'd be asking for probabilities under once in a millennium. The latest round has improved considerably in their ability to follow instructions (thank $DEITY), but they aren't anywhere near that yet.

[0] https://www.bbc.com/travel/article/20240222-air-canada-chatb...