I still think Nami has been superior by a large margin to Robin in terms of how she's been utilized in post-timeskip, fanservice moments or not (which I don't really give a shit about lol).
That gap is only going to get bigger moving forwards with Nami's possible connection to Ancient Weapons (Shirahoshi link), actual navigation to Laugh Tale, mysterious past regarding her birth that could be uncovered etc. Robin will have her moments with the Void Century revelation and that'll be really important too, but that's more to do with the overarching story as a whole than Robin specifically.