What's missing about Zoro is not feats, it's actual character development and exploration. Something nice would have been for him to go to Ryuma's grave, learn about his and Kuina's ties with Wano, or even him telling his crew onscreen about his past and Kuina and their promise.
Hell Wano could even have been an occasion for Tashigi, if she had come here, for her to get some much needed power-up and character development too, perhaps even some more depthened interactions with Zoro about their respective motivations and dreams and Kuina.