There's something else that is not just as symbolic as the bread and wine shared at the Last Supper, or even more so, and that is the sacrifices made since The Fall until the Cross which anticipated the Slain Lamb of God.
But neither the sacrifice of bulls and of goats, nor the shewbread could take away sin, nor can baked bread or grape juice which have never literally been changed.
Jesus did not pour out transubstantiated grape juice to cover and wash away sin.
Only the Blood which He shed once for all time and eternity could do that.
Amen and Amen!