To understand the life situation we often use metaphors. If the metaphor is a part of the reader's/listener's experience then there is a flash of understanding. The problem with scriptural writing is that the metaphors are outdated and don't make sense.
If the metaphor is man made then it does not quite capture the life situation which is organic and dynamic. It is more evocative to use a natural metaphors.
Having said this, I find the write up quite interesting.