I think your comment can be split into two questions: 1. Games derive some appeal from their intentionality and hand-crafted nature. Will these less-intentional experiences be as appealing? 2. Can these less-intentional tools still be used to create intentional designs?

On that first point I think it's important to remember that the lineage of video games comes from board & card games and sports. There's always been an ability to inject more complexity and less-intentionality into those things. Sports in some ways are like a simplified and altered role-play of war battles, and more realistic war roleplaying does exist but it has less appeal.

As humans we like solving things and noticing patterns and the intentionality of games taps into that appeal.

On the latter point I do think these world models will eventually be used to meaningfully contribute to building games. I think people will have to find new ways to design that balances intentionality against the freeform nature of these simulations, but it may take a while to have the capability to do so.