Enjoyable article, Roger - and fun to see so many of my photos were of use.
I'll take small exception to one point, and that's on the ease of pitching dome tents in adverse conditions. Many, if not most, can be staked down in advance, just like the tunnel tents. Start at the windward end (I often use my ice axe to create a strong first anchor point), and go from there. You can also pre-stake slacked guylines to get a start on that as well.
The Hilleberg dome tents (and others with external poles and clips) are particularly suited to this. Stake down the body, then put the poles in place; they offer little wind resistance at this point. You then clip up the body of the tent, working around its perimeter in stages. It's actually quite easy, even in a gale. Tighten up all guylines and you're set. It's no more difficult to do solo than to set up a tunnel tent - though it does indeed take a bit longer.
The larger Biblers are more problematic because they present a fair amount of surface area to the wind as you try to get the poles in place from the inside; the first couple of poles get a lot of pressure on them, and full stability is only reached when all are in place and the hook and loop fasteners or ties locking them together have been fully set. In the extreme conditions preceding my photo of the Tempest, those initial loads on the two main crossing poles caused them to bend.
In contrast, the Hilleberg poles go up with no fabric to catch the wind, and in the example of the Saivo, all seven crossing points are in place, and the pole ends are in very secure sleeves, before you start clipping up the fabric. This gives it excellent strength right from the start.
By the way, my photos of the Saivo don't make it clear that it has vestibules at both ends; so, for the photo of the Saivo partly buried in the snow near Lassen Peak, the other vestibule was more sheltered (although I'll note a quibble with the design of the Saivo and Jannu: the vestibules have a rather shallow slope and do collapse down some under snow loading).
One of the nice things about the Saivo's double-ended design and the way its vestibules are set up in an asymmetric design with four-way zippers is that regardless of shifts in the wind, there is always a way to enter and exit downwind. And, at the cost of additional weight, the dome design handles wind loading from any direction with aplomb, and can survive much greater static snow loading than a tunnel tent. This is really only important if you're leaving it out as a base - as you note, if you're inside or near the tent as the snow builds up, the best policy is to occasionally shake or shovel it off, regardless of the tent's design.
Thanks for helping spread the joy of winter camping - definitely my favorite time to be out there, and one that is accessible to all with just a bit of extra knowledge and suitable gear.