DY
Arbitrary with minhagim is hard to define. Consdier PEsach, Some avoid Carrots becasue the yiddish word mehren rhymes with yehren (old word for yeast). Should their descendents who dont speak yoddish practice this minhag in a day and age where even (most?) Yiddish speakers dont call yeast yehren. And even if it rhymes so what?
Many minhagim in practice today no longer have or never had a ratonal reason. We follow them becasue minhag avoseinu beyadeinu.