I think that has to do with One Piece being a victim of its own success.

I don't think Oda is aware of how truly bloated his story has become. This might not even be a popular among the One Piece fan base so it's probably not brought up. Oda probably just sees every new volume breaking the sales record previously made by his older volumes and just assume that all the fans are loving his story, so he should continue doing what he's doing.