If they were making a case that a thin bo is faster--which it is--and that that conferred an advantage in combat that outweighed the disadvantages of a weaker strike/block due to the lack of heft and the possibility of it breaking, I wouldn't mind. In FMA we often use very thin and light sticks for light contact sparring, but everyone uses heavier sticks for "real" fighting. I've whacked people hard with the rattan sticks and had them keep coming, albeit now sporting a sizeable bruise--where a hardwood stick would have broken something.