Earlier quoted context omitted.
I'm honestly not sure where all these hackernews commenters with low-dpi displays are coming from - my former employers equipped all the software engineers with dual-4K displays nearly a decade ago. One is hard-put to buy a developer-power laptop with a sub-2K display these days, even in the Windows world, and >2K displays have been cheap on desktop for a really long time.
Retina still isn't available for large monitors like 38" and above.
Retina is available for only a handful of 5k 27" monitors, most of which aren't great, and all of which are only 60Hz.
It's really hard to buy one given how expensive / badly specced they are compared to 4k monitors, even as someone who value the vertical pixels.