It’s his magnum opus.
A lot of artists in history would gladly die for their magnum opus. Some probably have.

Honestly to me one piece was just a reason for the main character to go out on an adventure. Especially when there are far more compelling stuff in the manga including characters/ their back stories and their impact on the world around them. The recent arc involving Sanji has been pretty amazing and honestly I care…

“I’ve never followed One Piece but from what I understood, the plot points have gone completely haywire and really doesn’t make sense anymore; as in, trying to end it would be an even more improbable task.”