The sai one looks practically unusable, too. Thinking of the usual angle I use to cut pizza, the crossguards will get in the way.

I see this as a great taste, horrible execution. Especially because the one executed the best would have been better as a katana rocker cutter (which the staff isn't, as a stick with a cutter in the middle is completely different from a single curved blade, to disagree with the other commenter).

A good set would have been katana rocker cutter, sai cutter (with a longer center blade and a smaller circular blade), a staff dough roller, and I guess nunchuck grain thrasher or maybe parmesan cheese and crushed pepper shakers. But I've always been a function over form kinda guy and hate artistic choices that completely ignore function.