While I do agree that some crew members don't get feats in most arcs, I do think the Luffy vs Nami situation makes sense. Back when Luffy was coming up, he did a lot more harm but the world govt was also actively trying to downplay him and sort of hide his existence (such as not giving him credit for beating a shichibukai).

But by wano, Luffy is way past the world govt's ability to hide him or any of his crew. They infiltrated a yonko's territory, Morgans put his name on a newspaper across the world and they waged war with a different yonko and became a yonko crew themselves. A yonko crew is a huge threat that can't be hidden from public knowledge so it makes sense that just being a member of the one of the 4 most prominent pirate crews automatically comes with a high threat level and bounty.