No, no it really doesn’t
Zoro or anyone doesn’t have to say out loud he’s using armament or observation haki to use it. It’s like saying invisible armament is useless because zoro isn’t saying he’s using it lol
Most fighters that have haki use it when they fight it’s pretty simple
Future sight is extremely rare
Same with penetrative armament
So is conquerors infusion while ironically being the most common so far
Also Kizaru relies on his defense to handle attacks
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The one with future sight comfortably wins