I actually “downgraded“ from a 43” 4K to a 30” (2560 x 1600). Trying to focus strained my eyes, and the brightness from the big monitor meant I had to position it as far back as I could on my desk, which made it even harder to focus and caused even more eye strain. I also realized a 16:10 ratio is more friendly for coding.

Frankly, 4K/5K monitors seem like a gimmick for most people. Especially puzzling is why you would pack so many pixels into smaller (~27“) monitors and require more power and graphics muscle for imperceptibly “better” images.