She used it to deny attacks and mobility. The ability to summon limbs almost anywhere in any configuration, including on your opponent themselves, is huge.
Robin typically summons an arm in the middle of someones back and strangles them. Imagine if that arm had Zoro’s strength. He wouldn’t even need to strangle them, he could just keep repeatedly punching them in the back of their head. It would also be used much more effectively on defense to block attacks as someone like Zoro has an incredibly high pain tolerance. What’s painful for Robin is a scratch for Zoro in some cases. The key point about the weakness of this Fruit is that the pain is felt, but the damage isn’t transferred (eg. She will feel a clone arm get cut, but she herself doesn’t actually get cut). Given the level of tolerance Zoro showed at the end of Thriller Bark means that he would be able to, say, throw up walls of limbs to block attacks and be fine (though not great) in situations where that would overwhelm Robin. And yes that’s my reasoning. Again, not saying she ever will be this capable, but more to highlight exactly how powerful she could be if she was someone like Luffy, Zoro, Sanji or Jinbe.
Furthermore, infusing her limbs with Haki would be really cool.
She could deal a lot of damage and Logia users would have a low chance of escaping her grasp.
*Theory by thepuppeter
