Nobody ever comes out and says it, but I think a lot of people think that theocentric preaching is boring preaching. The underlying assumption is that God is a little bit boring, or at least irrelevant to us. A preacher who helps us understand God, and our lives in light of God, is not as interesting as a practical sermon focused on our needs.
I think there might be a reason for this: preachers have made God boring. But it shouldn't have to be this way. You almost have to work to make God boring. Packer wrote these words in Knowing God years ago:
Knowing God is crucially important for the living of our lives…we are cruel to ourselves if we try to live in this world without knowing about the God whose world it is and who runs it. The world becomes a strange, mad, painful place, and life in it a disappointing and unpleasant business, for those who do not know about God. Disregard the study of God, and you sentenced yourself to stumble and blunder through life blindfolded, as it were, with no sense of direction and no understanding of what surrounds you. This way you can waste your life and lose your soul.
Ultimately, nothing is more relevant than God.