Just based on the fact that her dream and role in the crew is tied to the overall major OP plot which is the void century will always mean that Robin has a leg up on Nami in story relevancy.
Nami's dream will be completed off-screen because it isn't relevant for the plot.
Robin will not even reach laught tale without Nami.
Robin's dream is just a small portion of Nami's dream.
Most of the history even got revealed by other characters and not Robin.
I am 80% sure , someone else will reveal true history and not Robin.
Like always.
Whether it's all blue , reaching laugh tale , Usopp's desire to see Elbaf or Franky's dream of reaching end of grand line or Luffy desire to find one piece.
All of these dream is just a small portion of Nami's dream.
The amount of panels one receives doesn't mean anything when the majority of it really is just not relevant to anything. One of the worst Wano and OP plots period was BM's mother mode and why did that happen ?
Because Nami and Usopp can't pull their weight and thus plot has to come in and grant them undeserved wins.
That's the only objective way to look at relevancy and other things are just Headcanon.
Nami having 2nd most panel time and 2x more panel time than Robin makes Nami most relevant strawhat other than Luffy.
That also indicate that Robin is just a background character in comparison to Nami
I can accept she has less connection to world (that could change) but world is irrelevant too.
Because it's Luffy's story , so connection to Luffy is more important than world.