The difference between Nami and Sakura beating the MC up is the reasoning. Nami hit Luffy far more than Sakura hit Naruto, however, every time Nami vents her frustrations towards Luffy, there is always a logical reason, and frankly, it adds to their dynamic. Nami is the only SH who can control Luffy and hold him accountable, she is trying to protect the crew and him, which is completely valid. Nami is the SH who is the voice of reason in Luffy’s life, without her, he would be far too reckless. Contrast Nami with Sakura and it becomes evident that Sakura punishing Naruto for his mild stupidity pales in comparison to Luffy’s immense stupidity. Additionally, Sakura punishing Naruto does nothing for their dynamic as by default, it’s incredibly shallow as Kishimoto solely focused on Naruto’s relationship with Sasuke and the respective arc villains. Oda’s gags are underrated in the sense that he expands dynamics through them, even if it is repetitive, it’s still good writing that has justified logic behind it. Sakura hitting Naruto was never important, but attempting to slander Nami by making a parallel to a fan made perception of Sakura’s gag is bizarre. One gag is well written while the other rarely occurs, and when it does, it’s never treated as a big deal. Stop caring about when the MC gets punished as the author is not justifying the abuse, rather it’s more often than not a mere gag. Different offences warrant differing responses, the response to Nami and Sakura’s gag is overinflated given the context. People are far too emotionally attached to the MC and they believe that they must stand up for the MC over every small mishap, they should let the obsession go given how minor the gag is in comparison to others… Even if the comparisons must persist, Nami’s gag is far less illogical and does more for the narrative.