One Piece just hit its "half way mark"
The same reason why kids like many cartoons that don't make sense.
Anyway the video games were legit RPGs at least the Red, Blue, Yellow games I've played.
As for the anime I stopped watching it when it became evident that Ash was never gonna become a Pokemon Master just like how One Piece has the crew going on for years and Luffy ain't even Pirate King yet
the thing i hat about Shounen is that its perpetually ongoing and excessively long. How the fukk that shyt been going on since 1997 and is only "half way" to completion? that's pushing 16 years. the people that started reading One Piece as kids are likely adults now and will be in what their 30-40s by the time its finished?
as for Pokemon its rubbish. its been going on for too long and they just keep adding more and more of them. that and the fact that they will probably never make an MMORPG of it.