Look,
@pemerton, I'm sure you know these systems far better than I. Fair enough. But, are these completely refereeless systems? Is there a referee? If yes, then there is someone, at some point, who can determine outcomes. Even the player's narration of outcomes can be influenced by a referee simply by altering the input states. There are just so many ways that the referee, if they want to, can force MMI situations.
Is it harder in these systems? Maybe. I have no idea. I don't play those games and I'll take your word for it. But, it seems in this thread that people insist that an obviously negative term, MMI, is somehow neutral and it's not. It's always a negative term. And, in play, where MMI is found, not between the covers of a book, but in actual play, I find it extremely difficult to believe that it's impossible to devolve play into MMI.