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In proper factories, the driver has a torque-limiting clutch and a slip detector, so it turns off once it starts slipping. In back street metal bashing shops, the driver is forced out of the fastener head at approximately the desired torque because the flank contact of a Phillips recess has a slope which is always tending to push it out. If the operator is a gorilla, they will just ignore this and keep spinning the tool, rounding off all the corners and making it impossible to reuse the fastener.
https://en.wikipedia.org/wiki/Cam_out
gbj_tester
So the driver spins when the screw is 'tight enough'?