Why limit submissions to text and not podcasts or videos?

This limitation encourages us to exercise our writing and our reading and analysis skills. God gave us His Word in writing, in a book. It is precise. It is recorded. It is able to be analyzed by multiple people at the same time. It can be diagrammed and broken down. While a sermon or discussion recorded on audio or video may also be accessible, it is much harder to pick out that one sentence and go back over it multiple times, diagram it, etc., without actually producing the written transcript anyway. Furthermore, we permit much more variation in language in public speaking than we do in writing, particularly since public speaking can include gestures and other nonverbal cues. Without those cues, the transcript of a spoken discussion may not fully reflect the discussion. Therefore, we will limit ourselves to textual discussions.