My complaint is that if a communication is generated by AI, it is unclear to anyone receiving it whether it is a sincere and truthful representation of the state of affairs (for lack of better terms) of the sender.
Personally, I think that ideally, if a person, or company, or organization, uses generative AI to automate any form of communication, whether it is a tweet, a letter, an email, a memo, a mission statement, a research paper, or whatever, they should indicate clearly that it, or which parts of it, was/were generated by AI.
Otherwise, even without the intent to deceive and confuse, people will be blurring, or obfuscating, each other's understanding of each other. It will ultimately make us isolated, confused, and unable to collaborate effectively.