This is well said. I have experienced same thing. They will talk lot about ideas but not try to understand what is happening under the hood and plainly ignore other's concerns instead taking them positively and thinking about it. They lie lot or just talk vague and escape when real problem comes.
- typically speaks more and either not listening or ignoring what you (or others) say.
- typically excited about [mostly] his ideas and either refusing or not participating in discussions about the next practical steps.
I know of a perfect dreamer which i never enter into mutual business with. However i often listen to his ideas.