My current 16:9 24" 4k display in portrait is too tall---have to move my head up and down a lot, and too skinny---hard to put two windows side by side comfortably. Have to fiddle with overlapping windows a lot. In landscape it would be too short, and I rarely watch movies on my desktop. One movie trailer a quarter approximately, so optimizing for that use case is absurd.
I would prefer a fatter 16:10 instead, and was happy with the 22" 1920x1200 that was replaced, though I love the increased resolution of the new monitor.