As I've posted a few times, we are known to do some running changes (i.e., not wait until model year to make changes if they provide a benefit).
This one may be personal preference, but with a "detachable" cord you can store it wherever want and even on top of things. The attached cord if its coiled up where it is, you may need to take some stuff out to get to the end. Also if you want to keep the storage door closed you have to run it through a hole. By going detached we can also eliminate the cord hole.
When we lowered the unit and widened the unit we had a chance to design this in as well. So we did. No other reason than we thought it was a good idea.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).