Because OP as a manga has drastically changed since Enies Lobby. Initially, yes Nami was a clearly very important character, but Enies Libby is when OP turned into a battle centric manga and Nami as a character didn’t fit the new manga styling.
Her role as a navigator gets touched on some, but it’s no longer important. I still stand by the biggest insult Oda did to her was having the Barto club be new world pirates without a navigator showing her role was barely needed.
She will hopefully get some shine, in the future, but she’s not the tritagonist of the straw hats anymore, that’s Sanji. Nami and Usopp are each the human character the readers are supposed to connect to. (Like leorio in HxH/Zenitsu in KNY/Magna in BC)
Her role as a navigator gets touched on some, but it’s no longer important. I still stand by the biggest insult Oda did to her was having the Barto club be new world pirates without a navigator showing her role was barely needed.
She will hopefully get some shine, in the future, but she’s not the tritagonist of the straw hats anymore, that’s Sanji. Nami and Usopp are each the human character the readers are supposed to connect to. (Like leorio in HxH/Zenitsu in KNY/Magna in BC)