I would think it more often advantageous to detach from a motorcycle than to be part of the wreckage. The structure would only provide protection from the slowest of impacts, and abrasion is rarely life threatening. It's the sudden change in velocity that usually spells disaster for the biker. I'd like the opportunity to leap from my bike if needed.
That said, I would not hesitate to ride in an enclosed bike because I am not risk adverse.
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