I also don't understand why more people don't use it - but perhaps people try it out with a 1080p monitor, find it a bit cramped, and decide against it. (I used 1200x1920 monitors for a while, and the screens always felt a bit too narrow even with that. A lot of programs and sites seem to assume you've got a monitor that's at least 1280 pixels wide, so you end up with extra scroll bars, cramped UI, or stuff that's simply inaccessible.)
I was thinking about something similar but I am a bit concerned about having to move my head up and down to be able to focus on the entire screen.
I do still find the full height a bit much, so I typically have each screen split half and half, or one third and two thirds. Depending on what I'm doing and which program(s) I'm using, this either means two windows, and I use a window layout program to arrange things, or one window split into panels, and I just put the split points where I want them.
(3 x 1/3 is also quite usable - 3 x 1440x850. On some laptops, that's about all you get in total...)
E.g. if I'm calling a function I love to be able to have its definition up on the same screen at the same time. Also when writing commit messages, love to be able to have the diff up next to the COMMIT_EDITMSG.
Plus, now I think about it, I don't think I very often operate on functions that don't fit vertically on my landscape screen.
Now, if I could only use tileing window manager with this setup...
Ultra-wide screens can fix that. And using Windows' auto-arranging two windows side-by-side makes them perfect for the kind of workflows that require switching between 2 windows (web dev).
Vertical monitor I usually use for taking nodes, referring to code, or splitting bottom / top. Horizontal monitors are great for watching videos or tutorials, or splitting left/right side.
I usually use 27" IPS monitors that can rotate as well, with VESA mount capability. Dell (U2415H) makes the best ones in my opinion, it's not the cheapest ($300 each), but if you're staring at a monitor all day long it's a cheap investment
I tried to run with a configuration like this recently, but it didn't work out for me.
Try DAW or NLE work...
so far the best setup that works with me is 3 monitors: 1x landscape (left) and 2x portrait (right)
using something like Spectacle [0] to arrange the windows quickly
VSCode spread on the 2 portraits in a grid (2x2) layout is pretty roomy
I found out that 25" monitors work better than 27" (too high and not wide enough in portrait)
I like the Dell UtlraSharp but YMMV