Your examples are things that most humans cannot do, or things that AI can already do. For example most humans, even most intelligent humans, could not write a well-received book, run a successful company, or make a popular game. On the other hand, AI can absolutely sort through research, draw conclusions on complex topics, and argue them persuasively. Likewise, I don't know what you mean by a "decent" conversation, but millions of people converse with chatbots daily, so I don't know why you say AI fails to meet that bar.

I fail to see how what you describe is any better than the old autocomplete-on-steroids comparison. Could the human mind learn to spell every word properly? Yes. Do most (or any) do it? No. Does that mean a human can't?

I think what OP was drawing a comparison to is that AI right now could not come up with an award winning novel from the spark of some creative notion and working up from there, as opposed to just mashing together what has already been done and calling it a day.