Pretimeskip Nami hit her crewmates all the time, manipulated them into loans that they will never be able to pay back, charged them for everything, but now post timeskip, those qualities are basically all gone or less apparent. Additionally, Nami was also improved in bravery and strength, something her crewmate Usopp has been completely withheld of.
If Oda could improve Nami's character, then he can improve every straw hats character but refuses to do so. Sanji's gag is a complete contradiction to his values, he wasn't even introduced to be an over the top creep, that addition to his character came in Thriller Bark.
Zoro's genericness could also be improved on so he doesn't feel so forced and boring. Usopp's gag could also be dialed down as well, but Nami is the only one who gets the improvement to her character.
Ultimately, I think Nami had to be improved because she was the main heroine of the show, so the shows popularity depends on audiences liking her. Zoro and Usopp are hard characters to improve, Sanji though is an easy layup, his character was never a nose bleed simp in the first place.
If Oda could improve Nami's character, then he can improve every straw hats character but refuses to do so. Sanji's gag is a complete contradiction to his values, he wasn't even introduced to be an over the top creep, that addition to his character came in Thriller Bark.
Zoro's genericness could also be improved on so he doesn't feel so forced and boring. Usopp's gag could also be dialed down as well, but Nami is the only one who gets the improvement to her character.
Ultimately, I think Nami had to be improved because she was the main heroine of the show, so the shows popularity depends on audiences liking her. Zoro and Usopp are hard characters to improve, Sanji though is an easy layup, his character was never a nose bleed simp in the first place.