If you only compare the sermon to the hymns, it does seem a little redundant. But if I look around my workplace, clear, frequent communication is absolutely a huge need.
Again, this is purely anecdotal and at best rational only. Our field is already loaded with rationality, and most of our "this is clearly better" cases fail to reveal any improvements in case studies.
If people are so certain it is better and believe it is important, let them stake money on it and do research. Until then, the cat is both dead and alive.
