I've been reading One Piece since the end of Skypiea.
And I never said it's not for everyone. My point of the entire thing is we are reading an unfinished product, that was initially only to last 5 years. Obviously Oda had his core themes thought up way back then.
Manga is written weekly. It takes time for an Author to introduce everything they want, because of how limited the release is. It takes time for the entire story to be told the way it is intended. And this is statement about mangas in general, not just One Piece.
WI things change along the way? Of course. But Oda has made it abundantly clear over the years, that he has a clear vision for the ending of One Piece, and that's exactly where we are now.