> AI writing smell is as bad as bad grammar

It sounds to me like you want to censor perfectly fine phrasing just because AI rolled the dice to use it. Let's not forget that AI learned to "speak" from people in the first place.

Not to mention that as people shift their phrasing to avoid being accused of using AI, the AI will keep evolving, training on the new phrasing and then adopting it, too.

I understand the language evolves, but evolving language just to sound different from AI feels like wasting effort better spent elsewhere. On actual substance of the message for example.

You can believe what you want. I don't censor bad grammar, but it's not good writing, and it will have negative effects on someone's writing and who will read it. You can have your fingers in your ears or you can adapt.