I have no love for fighting knives
and I have no interest or knowledge in knife fighting other than from a historical, cultural and bio mechanics standpoint, haha.
Perhaps if trench knives were effective, they would still be in use widely. Perhaps if nunchakus were effective against riot gear, they would be banned everywhere (riot gear is the same in most countries, I assume). Perhaps........ah well.
Sometimes, the laws are a legacy from the past - you have to go to the actual deliberations, decisions to understand where they came from (whether due to proper consideration or otherwise) - bike chains, parangs, spears etc were more commonly used in the past, as were knuckle dusters (they are still here, smuggled in as always). Some items are prohibited due to the fact that they can be concealed easily. Look at the laws carefully - the list is NOT exhaustive. There is an overarching prohibition against 'anything that is deemed (by the courts) as offensive'. Do the courts have indepth or specialist knowledge about escrima, fencing etc etc other than the standard combatives learnt during NS? (if there still is).
Sometimes misinformation is hard to discern from reality, and misinformation spreads like grease on a clean floor....slowly but hard as hell to clean up
Back to the regular programming....and more on the utilitarian aspect of cutting tools. Certain discussions are best done with the right setting and right context
YMMV greatly