So McDonald's is now the best food in town according to your logic? Or that Hitler was the best leader for Germany during his time, right? The popularity of something doesn't correlate to what is simply factual about that thing. We're talking about grading a product for what it is, not how high something's trending. Anyone can like something, but it's something else to articulate the why, and it's a completely different thing altogether to withhold said reasoning of liking something under scrutiny. I've seen people make up reasoning for liking a thing out of thin air, and seen such false notions spread.
Popularity doesn't answer the why of how One Piece is rated. We have to understand the actual details why people rate One Piece as they do, and a simple number isn't able to answer this enigma as a sale number alone can't be used to rate anything other than it's marketability.
It's your perogative to use marketability as a determination of how good something is, but that alone only tells us about it's popularity, and absolutely nothing else. It can't even tell us why it is popular, only that it is popular, which is in a way circular reasoning on your part as your not explaining why is popular.
Popularity doesn't answer the why of how One Piece is rated. We have to understand the actual details why people rate One Piece as they do, and a simple number isn't able to answer this enigma as a sale number alone can't be used to rate anything other than it's marketability.
It's your perogative to use marketability as a determination of how good something is, but that alone only tells us about it's popularity, and absolutely nothing else. It can't even tell us why it is popular, only that it is popular, which is in a way circular reasoning on your part as your not explaining why is popular.