They don't always sound formal and robotic. You can tell an AI to sound like a certain writer, and it will write in their style.
I am waiting for when the AI can simulate my style, cause having a bot who can write like Edgar Allen Poe is cool, but kinda useless for me.
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In my experience, the formality is around how it structures articles. If you're writing something academic, I can see the benefit. But, I tend to write in an informal style with hints of formal thrown in when I need to dive deep into something. But, the stuff I've tried generating sounds like a computer very much wrote it. I like the style emulation idea. One day, you'll see AI that can be trained on your emails and other writings to emulate your style.
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