For what that part is, you'd think they'd be tempted to fit that as standard, OK might be a bit OTT but if it will save you well into 4 figures, well.....
Damn right JPM, but then you could say that for all the manufacturers.
I had chains snap on me twice (not on Ducs) and seen the mess. Fortunately (for me) neither of the bikes were mine (one was a dealer's loan bike).
Also, a friend of a friend had a chain snap on a ZZR11 after going over a crest in France at about 150 - locked the back up - got very messy indeed (long and gruesome story). The little guard won't stop this sadly.