hurr its true most wins are decided by the new attack skill name, but one piece has used strategy in its fights not once but in almost all its battles, here are a couple of rexamples.
Sanji each time uses his cig to burn/distract his foes.
Luffy using water to cocodrile, then blood, then usually instead of stretching his arm to punch, he just stretches to get closer to the enemy, also disabling his brain and doing aleatory attacks against enel, Mirror against Foxy. using his body as a strain instead of a weapon, like that priest that sanji headcrashed.
any of Ussop, Franky, Robin or Nami fights usualy involve a lot of strategy, ussop last fight he won by orchestrating FEAR.