Here's a spicy question: what do you find disingenuous in poetry?

Don't confuse disingenuous as being unauthentic or fake, because these concepts are not the same thing. To be disingenuous is to pretend that you know less about something than what you know. Essentially not being candid or sincere. Think of a spy when he's being tortured for information in a film. We all know from the viewer's perspective that the spy knows the answer, but is refusing to tell their captor. The spy is being disingenuous. He's not lying. He's just refusing to give that particular information away.

In this sense, I don't think poetry can be considered disingenuous in itself.

Having said this, in principle, I do think that a writer can be disingenuous towards themselves and their written work. Consider how many times you've written and re-written a single piece of prose because you didn't like what it was before the change. Who's to say what the prose was before wasn't good enough? A writer only has themselves to be held accountable for. Essentially, you are the master of your demise. A writer can only hold themselves back by withholding information that they otherwise want to convey. This is why, when I mentor folks, I tell them to write down everything that comes to mind. A writer is being disingenuous by not including every possible version of the prose. For all you know, that little idea you had might be your saving grace.