While two doors are ideal for two people, the addition of a second door on a solo tent just adds weight that is difficult to justify. My preference for a rear cover is a permanently closed vestibule, accessible from inside the tent for storage, and that can be pointed toward the prevailing wind when pitching in an exposed area. A common example would be the rear of a Hubba, and the many others like it, if the vestibules were a little larger and accessible from inside the tent. This creates storage other than where it blocks access through the front vestibule, and the larger, less vertical rear cover is more wind shedding.
Adding a few more square feet under the rear cover has a negligible weight penalty in these days of Cuben; but a zipper is a zipper, and after poles, they are one of the major weight makers.
Glad you found two of what you were looking for in the BPL class. Tent designing involves balancing a multitude of factors and priorities, so is a good and enjoyable way to keep the mind active. Kudos to those who come up with products that are true improvements.