Stuart. I don't understand the aerodynamic principals to tent geometry you are describing. Are you saying that a tunnel/tarp is better?
I thought a geodesic shape was more about more useful internal space with adding snow-loading capability, the height is available for more of the width with relatively short sections of unsupported fabric? Geodesics all seem very heavy to me, more a mountain basecamp type solution than thru-hike solution, but I never tried one.
I had a tunnel once, it would bounce and flop all over the place wacking my head with hard pole, but it did have a clever tensioner which basically turned it back into an A-frame at the hoops, but it still had a long unsupported area which was challenging to make tense and the bathtub sagged so much my wife used it and woke inside a swimming pool. I tried it for 3 nights, my wife for 2 nights and we sold it. That was called a Vango TBS Spirit 200+ . Look at this video of all the sagging wrinkled flysheet, apply wind in your mind's eye....
Single-hope structures I prefer to tunnel just from hands-on experience, I preferred the hoop ends at head-foot as the vertical side it makes is then benefiting the headroom when lying down and harder to touch fly in the night at the foot end. The downside is when you sit up your head has a very narrow area to move in.
If this geometry was made in simpler lighter design, with plenty of height, it would be brilliant. Extending to two vestibules would be a doddle.
Not many tents like that, and TT doesn't do any, although the Moment's optional hoop has a little bit of that benefit. Hoops traversing the left/right, often leaves a long supported area right where the head is, add with lightweight fabrics and its like sleeping next to a crisp packet (think Neoair 360degs around you!). The TT has this geometry with the Moment and the Scarp but both use quieter heavier fabrics and optional hoop support.
Fundamentally, I prefer classic A-frame shapes, straight lines less to move, having the height in just one central area is simply easy to live in.
There is a slight worry with the Notch beyond what I posted in other threads, the unsupported area between the poles, its only a small tiny worry but I was thinking it might benefit from a section of pole there, but that is more complication, more weight, etc , just unsupported areas tend to cause flapping noise.