I never understood banning nunchucks. They kind of ban themselves.
If you've ever been a kid copying TMNT Michelangelo with home made nunchucks you've almost certainly smacked yourself in the face.
Y'know what's martially better than two sticks with a string between them? A single big stick.
Cuz ninja, of course.
The reason is slaves needed a stick for rice - putting a chain between two stick sill works fine for rice work - but makes it a much worse weapon.