I get that, but it was a seriously missed opportunity
Tashigi was the perfect character to have zoro move on and forget about kuina, imagine if she was actually involved in zoro's character development that led him to give up his dream for luffy
I think oda originally wanted to have something similar happen but the storyline got too messed up and only very basic stuff was left, otherwise I don't see the point in having tashigi parralel kuina since it doesn't add anything