I think the words "a" and "model" in "a world model" are both bad. People do that sometimes (for instance I was at the Ren Faire recently and aimed the bow whe

I think the words "a" and "model" in "a world model" are both bad. People do that sometimes (for instance I was at the Ren Faire recently and aimed the bow when I tried archery), but people are limited by time and calories so must be energy-efficient, which means they can't afford to spend effort making a model that isn't necessary. And what's necessary is very specific to the task or context you're in. For instance, you don't need to know what's in the garbage to throw it out. But you do need to know what's in the recycling to put it in the right bin.