Yes, on IPS LG and Dell ultra-wides. 34" 1440 ultra-wides are ~identical to 27/28" 1440 screens in PPI. Nothing to do with 4K, still the amount of pixels is higher. It is only a wider display. Doesn’t really replace to screens in full, but is enough to replace dual 1080 if you wish to accept a bit lower width.
Coding is fine, especially in situations where you have a lot of toolbars that eat into your width.
4K is special. The PPI (pixel per inch) is significantly higher and thus unusable at native resolution unless you’re at minimum of 31/32" diagonal size. 4K is used to increase picture fidelity, not screen real-estate.
If you’re willing to go for a 40" screen you can take advantage of the actual size and use 4K at native.
Don’t get me wrong, but it does not. It gives density, not width and height. Usable width and height remains the same for normal distances. It gives more pixels per inch, but at native resolution (without scaling) it render UI elements proportionally smaller since pixel density is 50% higher - your text and UI elements will look much smaller.
- 3440x1440 gives you identical PPI of ~110 so it is giving you more screen space.
- 4K (3840x2160) gives you PPI of ~163 but you need to scale it back to ~110.
To get PPI of ~110 you need 40" screen with a 4K resolution.