Why? We already had all of them go through some development or the other in their introductory arcs or a little later into the story.
and most of them still get neg diffed

By your logic Usopp is fine as is since he can't be one shot by Kizaru, which is embarrassing for Kizaru but also for SHPs
None of them can actually fight some of the fodders in the show, just survive them.
 
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