Don't you think that with the lack of any visual and physical interactions, it's hard to really know what the person you talking to is really like in person? Because right now we do not know how we act or what we truely look like. Although I completely trust you, there is always a a chance. Without these interactions there is a missing piece is the element of friendship and relationships. We think about each other and create our own visual picture of how one another will be like.