
Large-scale datasets have driven remarkable progress in general-purpose robot policies. But they're almost always collected with the robot as the sole agent — no human in the scene.
So policies can do a task in isolation, yet fall short where robots are actually deployed: homes, factories, shared workspaces. They never learn to hand over, yield to a reaching hand, or avoid a co-present person — because those behaviors can't be demonstrated without a human there.
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