Its true that Nami is not as well written in the TS. I think its a problem with pretty much all of the crew except for Luffy, Zoro, and Sanji.
Fighting abilities and looks are important but I can't imagine Yamato having interesting interactions with the crew apart from Zoro due to Ushimaru. I think this is where Nami completely outshines Kaido's daugther as a character.