Too much stretch. If you cut out all the useless panels and reactions (Usopp's reactions and "Enel facing", only reactions of top tiers or other important characters matters), a bunch of all sorts of useless characters (like those NPCs from Wano), useless actions of the main characters (infamous running up the stairs, etc.), then you can reduce the length of post ts by 40-50% and finish the entire One Piece already. I would also like to note the deterioration in the quality of drawing and paneling. Either the author simply doesn’t care anymore, or Oda simply hired a team to do everything for him while he gives general instructions. It is impossible to degrade so much in drawing when you have been doing it for more than 15 years.