adding to the dilemma
Are you a backpacker who prefers to hike, or one who base camps or car camps often?
What follows is for backpackers who like to hike:
Considering your high desert location, you could have one add-on door or a slightly long tarp for folding just one end into a door. Hangers have many more camp site choices than tenters, so use that to your advantage, picking your sites more carefully during your summer monsoon season.
If necessary, you could move an add-on door to the other end in the middle of the night. Unpleasant, but doable. With a full length ridgeline, you could slide your slightly long tarp in order to make a door on one end, hours after the tarp was up.
For three season use for hangers in wetter climates than yours, they could go with a very long, rectangular tarp so they can fold the ends into doors, but only as needed.
The year 'round backpacking of a winter tarp is wasted effort. Build what you will use the most now, then build a winter tarp next fall. Have you tried any other hobbies where your entry level gear was still used for many years after your first few years?
For base camping, whether hiking or car use, carry the big ones on that one day in.
Very little of anyone's gear is perfectly suited for every season, and neither is your tarp. During your drier months, an 8 or 9 foot square tarp, rigged diagonally (pitched with just two stakes) is a joy to use in the Southwest. You know that you will dry out the next day, even if a portion of your gear gets slightly wet once from the reduced coverage.
That could all be summarized as use your brain and build your skills to avoiding needing to carry stuff that compensates for what you haven't studied.