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On an oval you hit the barrier more often than not at a glancing angle, pushing the wheel INTO the side of the car. The tether takes no load, the suspension does. This leaves the temporarily slackened tether intact to then drag the wheel along.
In F1, the wheels are more often hit at a more oblique angle ie from the back or front, rather than side. Here the tether, once the suspension snaps, takes the load as the wheel jettisons AWAY from the car: TWWWAAAAAAAAAANNNNGGGGG!!!!!! Tethers are useless in this situation.
Ofcourse they should be kept, however. They do work against concrete walls (not tyre walls, please note. They are hit at a more forwards angle, yes??) where the blow is a GLANCING one, the wheel hit INTO the side of the monocoque. They also take away abouth 5 tons of load in the action of the "TWANGING", so the wheels go far lees far.
THAT is why tethers "work2 in CART, and "are rubbish" in F1.
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