It's fine if you're okay with gigantic fonts that are usually seen on laptops. A lot of us prefer much smaller fonts to fit more code on the screen.

For example the equivalent of 9pt on a 900p display allows actually reasonably split-screen editing. On an actual 900p display though, it's much too blocky to be easily read without straining the eyes. At 1600p though, it's crystal clear.

Fonts are clearer and, assuming your vision is up to the task, you can fit more on the screen.

Other people may have other reasons for higher density displays, but those are mine.

Pixels are an artifact of our crappy technologies. They do nothing but detract from the actual point of a display.

I sure wouldn't want to spend my whole waking life wearing glasses that slightly-pixelized everything I saw. And since I spend a large amount of my waking life looking at "glowing rectangles", I'd rather they not be slightly-pixelized either.

Fonts are clearer, it stops me from getting eyestrain (because I don't register everything as slightly blurred), and it is a great help when working on photos.