World models are the workaround. You learn a compact internal simulator of how the world evolves, then you use it to rehearse: predict futures, test counterfactuals, generate edge cases, and'if you're brave'improve policies by 'living' inside imagined rollouts. The last few years have made one thing clear: a world model is not a single model. It's a stack of techniques, each one invented to patch a failure mode that kept showing up.
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