If katana wasn't superior why ninja has to throw shuriken????
But seriously, because of the hard time Japanese smiths had to create
proper steel (folding) out of the **** raw materials(iron sand) they had in the past,
they created a big mysticism about it.
The Japanese society managed to conserve this mysticism until the modern times and beyond,
infecting the rest of the world due movie and manga stuff with the idea of
the superior katana cutting everything and being the best weapon in the world.
But it's just BS. It's only a tool like every other weapon with it's own strength and weaknesses
like said before. For me it's only a 1 1/2h saber.