I consider them quite different.
No matter how good tethers are, stuff will come off of crashing cars, no way to avoid it at least and still be light and aerodynamic, but springs and such should not fly off cars that are not crashing!
Yes, open wheel/cockpit racing has these inherent dangers over closed, but the spring is just bizarre and should have had something retaining it.
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I am a Commodore PET --- Now get off my lawn you kids...
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