Scripture tells us why the office of deacon was created in Acts 6. There were squabbles between Hellenistic and Hebrew Christians over the care of those in need. The apostles said, “It would not be right for us to neglect the ministry of the word of God in order to wait on tables.” So they directed the congregation to pick seven men; the apostles said, “We will turn this responsibility over to them.” Clear, isn’t it? These folks don’t think so.
Yes, deacons have a liturgical role in distributing communion (and, in many Protestant churches, taking up the offering). But their primary role is to do the social ministry of the church. That’s why the office was created. It is their job to visit the sick, feed the hungry, distribute clothes–all the things needed to take care of brothers and sisters in need.