this is very true majority of Post-TS has been a huge let down. I think after the MF War Oda went with the catering to the more “shounen” troupe of action based and forgot about adventure and pirating. I think Skypiea depicts all of this perfectly. The only “treasure” hunting that’s down is for the One Piece and that’s about it.
I don’t think there really has been much that enjoyed realistically since Skypiea to MF. Not sure if it’s the nostalgia aspect of it all and the world building that went into the storyline today but all arcs have fallen flat unfortunately. Good moments but not a wow this arc is amazing moment.