Cool knife. I have never heard of them ... maybe need to make one?
I have never, and still do not, understood why a highly flexible western knives are called "boning" knives. Fillet knives yes, but boning?? I could never imagine using a thin flexible knife to dig in to joints, pry after and slice tendons, and then torque the joint apart, or cutting through the back to spatchcock a bird, nor could i envision a large chef knife having the maneuverability to do that ... and certainly could not envision a nakiri doing that...
So back to the op's question ... yeah, i would say that if you cook with poultry, than a stiff boning knife would be needed.