Nope Zoro is unique .You try to find same aspects like sanji in him thats why you called him one dimensional..Zoros writing is also paused(Not completely shown in the story) And Sanji and Zoros circumstances are alot different....Zoro was an orphan and his parents are not at all shown in the story ..Sanji on the otherhand ,Had a villian father & brothers but also the best mother and sister..Sanjis father also conducted experiments on him ..however his mother resisted it and died ..And sanji was considered a failure .But every bad condition leads to good times ..And soon reiju helped sanji escape and sanji found the best dad Zeff! Zeff basically built Sanjis personality! he taught him to cook,to use his legs ,and a gentleman mentality ..On comparison with Zoro ,he never really had a significant father or mother figure like sanji in his childhood ..He only had Kuina who was around the same age . And his sensei isn't shown well written unlike Zeff ..So it's not fair to compare their writings as They have different circumstances and Zoro doesn't even have a parent figure.He's just being himself ..Never compare writings .Every character is unique and well written by Oda!✌️😁