I agree with your generalization now that I give it some thought. Even for topics I have little interest in or know little of, creative solutions are enthralling.

Your latter assessment is why even arbitrary limitations commonly inspire interesting gameplay and art style IMO. I quickly grew tired of Assassin's Creed and similar open world games; in contrast, games like The Messenger can pull me in immediately.

The (admittedly few) game jams I've actually completed had limiting restrictions (i.e. 8/16-bit art/gameplay). Two things make me more productive/creative than normal: looming deadlines and limitations.