As someone who's still learning English, this is one thing I'd never use AI for, at least not in the near future, simply because thinking and structuring my thoughts before typing is the same as it is before speaking and actually talking to other people can't be outsourced to AI.
But I imagine if I'd been a native speaker I wouldn't mind using AI like OC does since it's a convenience. Same way I use a calculator for two digit multiplications in real life but spent years learning to do it manually in school.
You're probably further into english than I am into vietnamese, but I really like using AI to help me improve my vocabulary and understanding of the language.
I avoid using AI as a direct translation tool, but its super useful for me to translate complex english ideas to vietnamese.
As a native English Speaker I can tell you that I would have some trouble talking out an email. I like the back and forth in my head of editing as I go. Text messaging may be fine but email is more difficult for me to just talk through.
I am loving the conversation here though of how people are using speech to talk to LLMs or not though, it is something that no one talks about much