WHY SANJI IS VERY VERY WEAK :
Sanji's place in the crew is weakening at a time when stronger people are joining/might join (Jimbe/Yamato).
People refuse to see what the author is doing.
Sanji has reached the "Exit Stage Left" part of his character arc. He will die in Wano protecting a weaker member.
It's an incredibly sad ending for what was once a promising character, but there is no more character development to explore.
Zoro had to overcome his pride to become stronger for the crew.
Usoop has to constantly overcome his cowardice.
Franky and Brook both came back heavy hitters.
Sanji came back broken, weaker, and with zero development in areas it was needed. His inability to protect his crew from females is no longer a gag, it's a liability.
In this chapter he has put Robin in grave danger from Black Maria/Kaido/CP0.
Brook, Franky, Usopp, Luffy, Zoro, Nami, Jimbe, Yamato, etc. would never do that.
All this after leaving the crew and bringing harm upon his captain.
Trash character. Get him the fuck outta here.