They have amazing backstories.
But that doesnt mean anything if it's not backed up by good and engaging activities bar fan service.
Considering this is a shounen, Robin got the absolute shortest end of the stick by how much she was nerfed post-Alabasta.
Now she BARELY began rising in power against Black Maria, which is funny because people used to think Black Maria was the WEAKEST of the Flying 6 for absolutely no reason at all.
And people went fucking massive denial mode after her bounty was revealed to be higher than Sasaki's.
The "great women" of One Piece often tend to be pacifists that are "revered" as amazing people. But it falls short when every problem is solved by "beating the crap out of the bad guy anyway".
Toki was made into a breeding mare for the most imbecile character Oda's ever created.
Hyori got absolutely robbed of her moment by the "shining knight Denjiro".
Tashigi?
Holy fuck Tashigi.
Tashigi's been humiliated every chance Oda gets to make her appear in the story.
Called weak by everyone, even by a "good guy" like Law.
Tashigi began to shine when Oda decided to make her a babysitter for the PH kids.
Rebeca went from a cool Gladiator with an interesting fighting style to "save me, big hero daddy I can't do shit but cry" in a matter of seconds.
Just because Nami and Robin are slightly better than other shounen female casts, doesn't mean they are that "amazing" compared to other stories. They still fall short for 2023 standards.