It sounds possible that this monitor size will become popular but consider that as a poineer device the LG is priced over the cost of many large 4K monitors and most usable 40in-60in 4K TVs. I just bought two LG 32in 32UL500-W 4K monitors during the Eggs sale at ran head-to-head with Prime Days. They were $250 each and though also only 60hz they did have adaptive sync. I'm running an Acer 48in 4K monitor which I used for coding plus I have a Samsung 28in 4K as a secondary monitor and I have an old Seiki 39in 4K which defaults to a TV but is also connected to my PC to function as a third monitor when needed. That's 3840x2160 per monitor and in the L shape that I have them set up in that gives me a tallest vertical of 4320 pixels and longest horizontal of 7680 pixels. I have used both long dimensions before especially when working on large spreadsheets.
Even though I'm retired now I've kept the same arrangement as I am used to it.
My 4k monitor from the past has cost me 1800USD (has been introduced at 8000USD price) some 15 years ago If I remember correctly. It has paid for itself because of my saved time. I was more productive long before 4k became just even available for purchase in mass quantities. But I use it for CAD work on x86 workstation, don't want to overuse it so that its 10 CCFLs would die too soon. For this reason, I'm searching for a monitor to use for the other tasks, which are mainly portrait-centric. And I want it to work with Raspberry Pi 4.
Regarding your setup, though cool, is something different from a coder's and CAD user's work perspective. All of the vertical pixels should form a single screen, because squinting from one monitor to another when searching in text isn't pleasing, not counting a likely dpi/color tone mismatch. Power consumption is also a concern. Auxiliary secondary monitor is a plus in both cases.
Personally, I like monitors with high dpi more than the big ones. So, 4k on a 22'' monitor is more pleasing for me than on 32'' - it's sharper when placed on a typically sized desk (around 90cm from eyes).
The value for pros is different than for home users - the space saved, its longevity, ergonomy, more productivity - all of them account for. I think it would find its customers in a corporate sphere. Hopefully, somebody would test it with a Raspberry Pi ...