Here are my thoughts on the subject, just an opinion.
High speed, constant radius left hand sweeper. Rolling torque above what the springs and/or rollbars can counter, therefore the right side is against the upstops. You have no more uptravel left so essentially you have a rigid suspension on the right side of the car while in the turn. A slight bump comes along (even a very slight bump). The bump would cause both right side tires to lose contact with the ground (ignoring tire decompression, A arm flex and other things that I didn't think of). Even with zero damping, inertia would not allow the suspension to accelerate instantly to maintain tire contact. Right tire traction goes to zero.
While a chassis dragging would reduce traction it would not quite eliminate all of it and the suspension would drop (maybe?) as the chassis lifts and maintain some tire contact.
The tires leaving the ground would be a very rapid change while losing traction then again when when either the rolling torque pushes the tires back down or the suspension drops, while the chassis dragging would not have such a violent affect.
Just an opinion, no facts were involved in this post.
Not exactly an answer to your question but a possible solution to chassis dragging with possibly less affect on handling would be 2 stage springs or a more narrow chassis.