1) The pulpit keeps the preacher in her or his place. The preacher’s task is to help lead the congregation in worshipping God. He or she should not be the center of attention. When the preacher stands in the pulpit he or she is appropriately to the side. This prevents the temptation to walk or stand at the center of the chancel, in front of the Lord’s table which should always be the center of attention.
2) The pulpit represents the preaching office of the church. It is not intended to be a barrier. Rather, it is a symbol of the power and importance of the word. Preachers need to claim the authority, power, and responsibility of their office as heralds of God’s word and good news for the world.
3) The pulpit allows the preacher to use an outline, notes, or manuscript to guide her or his preaching. This will keep the message focused and minimize the tendency to wander and ramble and unnecessarily lengthen the sermon. Not only does the pulpit help to keep the preacher focused on the proclamation of the word, it also helps to keep the people focused on the word and not on the preacher. This is so because the pulpit minimizes the preacher’s movement and is less of a distraction. The word becomes more important than the preacher.
I'm not sure if I agree with him or not. I'd be interested to hear what other folks think.