@scottjenson
Great talk!
I'm espectially intrigued with the idea of maintaining clipboard provenance, that immediately feels like it would be useful to me.
The spatial ultrawide concept is neat, though I immediately see the issue of it being kinda physically tedious to drag your cursor over to a window docked off to the side.
I also still think that scrolling tiling window managers are interesting! I remember annoying you a little bit about them after watching that first talk.
On an ultrawide they achieve an effect somewhat similar to your idea: they keep one window in the middle of the physical screen, then having a few secondaries to the sides, and then the less-used windows you can shuffle off-screen entirely.