idk man i couldn't disagree with you more. yutapon cubes are a good way to show impact with clean animation. though i will say that toei does rely on them a bit too much, probably because they're so much easier to draw than other landscape changing impact effects.

I don't understand why people are against things such as auras, though. One Piece is huge, and has to compete with many flashy higher budget shows, so it only makes sense for toei to introduce more grandiose effects. While I agree One Piece has proved that you can have cool fights without the effects, I am inclined to say that it worked much better in pre-timeskip where the general scale of animation quality in anime was not as high tier as it is today, not to mention the fights typically revolved around momentum based attacks from Luffy. The fights were a lot more technical, which made them easier to enjoy. Nowadays, fights rely on all these different types of Haki, and Luffy has resorted to the "bigger fist = more damage" tactic. Which, without flashy effects, typically looks very boring. That's why the anime needed an art style and animation change going into Wano, because everyone was complaining that Fishman Island to WCI looked boring and soulless. Which it did.