>Sure, more pixels are always better. But does the sub-4K display look like crap or force bad sizes for controls? No.
Sure, I can work with a 3440x1440 34". Heck, I've worked with CGA monitors back in the day, and black and white (!) SUN Sparkstation monitors.
But, as you said, it's about looking better. "Doesn't look like crap" is a pretty low bar, no? For 2020, and after 10 years of hi-dpi phones and laptops, I expected better from monitor companies...
Not to the upthread specific claim that the resolution was “not quite 4K”, which is what the comment you are responding to addressed.
On the bigger issue, I don't really see the complaint. I have pretty good vision (corrected—to 20/15 or so—uncorrected is crap but I'm not coding without glasses/contacts) and honestly my 34” ultrawide at 3440x1440 is excellent for coding, and pretty much any other use. Now, would I prefer whatever resolution a 5K 16:9 would be when extended to 21:9? Or better a 4320p at the same aspect ratio? Sure, more pixels are always better. But does the sub-4K display look like crap or force bad sizes for controls? No.