>>281752516
Oda was forced to write strengths and weaknesses for every devil fruit, which is good writing. But now thanks to haki he can slack off and just make fights about brute strength.

If no haki existed Luffy would be losing the fight against Kizaru but at the last moment he discovers Kizaru is weak against mirrors or some shit and deflects him into water. It would be kino writing, but instead we get forgetful fights that only come down to brute strength.