But, most writing has purpose. And usually fulfilling that purpose requires readers to comprehend what you're writing. Conversational tone is easy to comprehend, and shockingly less ambiguous than you'd think, especially when tailored to the target audience.
Obviously no errors Vs no obvious errors, in a nutshell.
Isn’t this a bit short sighted? So if someone has a wide vocabulary and uses proper grammar, you mistrust them by default?
Yes, people, in general, do.
I don't trust anyone who doesn't use swear words, does that count?
Except that this signal is now being abused. People add into the prompts requesting a few typos. And requesting an informal style.
There was a guy complaining about AI generated comments on substack, where the guy had noticed the pattern of spelling mistakes in the AI responses. It is common enough now.
But yes, typos do match the writer - you can still notice certain mistakes that a human might make that an AI wouldn't generate. Humans are good at catching certain errors but not others, so there is a large bias in the mistakes they miss. And keyboard typos are different from touch autoincorrection. AI generated typos have their own flavour.
But... you know that this moment will be so fleeting as one can trivially generate mistakes to look human.
That's because it's their PhDs that did the actual work...