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On the racetrack kicking free of the bike and sliding to a stop works as long as your leathers hold up and someone else doesn't ride you over. The barriers usually are far enough away you don't have to worry much about hitting anything more substantial than a stack of hay bales. Sure, nobody wants to go through a tumble cycle with 300 lbs of unfriendly metal. The idea is to turn the bike into a protective device without it becoming just a mini cage. There are cars, trees, guardrails, etc that I don't want anyone to hit without as much protection as feasable.
Leg protection - small touring bar structures fore and aft of feet
Head, arms, and chest - front fairing outside hard skin over crushable core, inertial reel lapbelt.
Hip, shoulder, back - side panels and seat back of honeycomb aluminum or foam core laminate; head rest, crushable tailbox.
All this need not interfere with putting a knee down or make a 250cc feel like a truck.
Shoulder
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