Bruce. One scholar offers this opinion as to why wine was added: “[The Passover] was to be no longer a solemn annual mustering of male adults; it was to become the occasion for family festivity, in which the drinking of wine found a natural place. ” ​ — The Hebrew Passover — ​ From the Earliest Times to A.D. 70, by J.
From the Earliest Times to A.D‏ —‏ The Hebrew Passover (הפסח העברי — מימי ־ קדם עד ל ־ 70 לספירה), מאת ג ’.