Desirable to some, preferred by others.Confused, are these desirable for some reason?
Also, You HAVE to remove the big headrests to fold the seats flat, with the smaller ones you don'tDesirable to some, preferred by others.
For several decades, groups such as the NHTSA only tested front and side impacts on the driver and front passenger. During the mid 2000's there was a push to test rear passenger safety as well.
I suspect Nissan recognized the need to make a change in their rear head to meet the upcoming mandates.
Needless to say, the change in headrest was that of a larger design which can block your rearward viewing.