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Also, undertails weigh more. Especially if you can't afford titanium. Not to mention the oversized subframe you need to support the muffler and pipes. On the V4 GP bikes, the reasons as you mentioned make sense. And on street bikes, who cares. You need an oversized subframe to lug your girl (or boy, I don't judge) around anyway.
EDIT: ipso facto, I like the bike. Hate the exhaust. Ditch it for a nice header/can combo. Why did they have to make the exhaust part of the fairing lines?