Maybe this is a personal experience. As a non-native English speaker who works in academia. I learned formal English since I was a child. ChatGPT/bard will produce a much quicker formal professional email than I will do. But if I took my time to check the email, I would produce a similar email, which is actually how I normally write if I'm sending an email to a professor or someone else in the field. AI like bard or ChatGPT will be a huge time saver in such cases. However, living in the US for half a decade changed a lot.