Even as a dev, I use a 32" QHD screen for programming. If I went 4K, I would need to use 150% scaling, and that breaks a LOT of stuff.

Everything is built for 100% scaling. Every time I've plugged my PC into a 4K display I've regretted it. It go to 30Hz (on HDMI) or glitch out or something. Even if it doesn't, it's never as smooth.