Dexterity Over Data: Why Sign Language Broke Generic 3D Pose Models
Hands are small, fast, and inconvenient. That is a problem for AI systems that prefer the world to be large, slow, and conveniently labeled. A walking person can be reconstructed with some tolerance for imprecision. A signer cannot. In sign language, a curled finger, wrist angle, palm orientation, or moment of hand-body contact may carry meaning. When the model gets that wrong, it is not merely producing an awkward avatar. It is quietly changing the message. ...