> Now show me the AI write something that's actually good on purpose

The average human can't even write a 3000 word short story that is good "on purpose" even if they tried.

I know because I've participated in many writing workshops.

The real question is: can you?

> AI can write an argument that's bad on purpose

Are you able to recognise good writing? How do I know? For all I know you're the most incompetent reader and writer on the planet. But your skills are irrelevant.

What's relevant is that deep learning is more skilled than the average person. If you're not aware of this you're either a luddite or confused about the state of the art.