If content creators can't find anything that is uniquely human and cannot be made by AI, then maybe they are not creative enough for the job. The thing about generative AI is that it can take context, you can put a lot or very little guidance in it. The more you specify, the more you can mix your own unique sauce in the final result.

I personally use AI for text style changes, as a summarizer of ideas and as rubber duck, something to bounce ideas off of. It's good to get ideas flowing and sometimes can help you realize things you missed, or frame something better than you could.