I might point out that most “real world” problems not only have very large fan out, but the introduction of possible moves itself requires intelligence (and creativity). Suppose for example you are at a shop buying vegetables and you think the price is too high, you can negotiate a lower price, but then you need to come up with strategies for negotiation, you can go search for another shop, you can decide to buy online, you can not eat vegetables and buy vitamin pills instead to make up the nutrition deficit, you could steal the food, you could beg for food, you could grow your own vegetables, etc. Each of these options itself would open up more variations.