For programming, pixel density will probably just get me smoother fonts. Previously it might have gotten me more lines of fonts, as I could've reduced the font

For programming, pixel density will probably just get me smoother fonts. Previously it might have gotten me more lines of fonts, as I could've reduced the font size will maintaining readability. But I think I've reached a limit there, where further decreasing the point size just hurts. And honestly, with your usual fare of monochromatic fonts and current font smoothing tech, I'm quite okay even with "just" 1900x1200 resolution. For other stuff, sure, more pixels won't hurt. Reading PDF at high ppi devices is a joy. But getting back to programming, I wonder how I'd cope with a 39" display. At the same position where my monitors are now, I could probably replace two with just the one. With two monitors my viewing angle is too wide anyway, so again I'd mostly use either one half of the screen for lots of stuff while paused videos and web pages occupy the rest, or just push everything to the sides and focus on the center. Maybe TekWar had it right...