It don’t mean a thing if it aint got that swing.
Duke Ellington’s point was simple: Across all genres and eras, music needs to swing. It’s a creative constant. I make a similar point about fun, arguing that it too is a creative constant and a game is not a game if it lacks the joy of winning while mastering fair game dynamics.
But some kinds of fun are more appealing than others. Some are innately fascinating and inspire the play brain to play, where others just don’t. I call it the law of fascination.