Yes, there are things about the book Homiletic that conservative Christians would disagree with.  But this shouldn’t be one of them:

We are not appealing to a sense of artistic pride — although perhaps it would not hurt — but, rather, we are trying to remember holy responsibilities involved in preaching.  We speak of God in the presence of God.  We speak to neighbors, loving our neighbors.  Slapdash may be what we think we want, but not if we think deeply.  If we stand before God we must be respectfully truthful.  If we serve neighbors, we must care for the careful forming of their faith.  Both concerns shatter the dream of quick-fix sermons: Love is a labor, particularly a love of God and neighbors.  (David Buttrick, 317)