It has it's own uses. Kaido's DF is better for direct combat. It was hyped for strength in god valley and not paw fruit.
Strength≠ abilities. Kaido's fruit is almost all about boosting physical attributes while Kuma's really has repelling and pain absorbing abilities. Basically he can just turn your attacks and damage caused against you. He even can heal himself while removing pain.
That's better wincoin than breathing fire and swinging club.
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Kuma's paw can ignore physical durability aswell, his paws goes through bodies like nothing (similar to Rokugan)