A request for proposal for a specific program may require the company to review the bids to not only examine their feasibility but also the health of the bidding company and the ability of the bidder to actually do what is proposed.
The most obvious reason for using spatial imagery in metaphors is that the language of the primary processes (e.g., dreams) is spatial imagery. This can explain everything, but is trivial: it is always true, and you cannot make meaningful distinctions with it in a text or in changing contexts.
Spatial organization is when information in a passage is organized in order of space or location. If you were to describe the room in which you were sitting right now, you would be using spatial organization.