I think part of the reason is that high DPI support was completely broken under windows for at least a decade after it was working fine in MacOS and Linux (pre-wayland and the rise of "HiDPI support").
Most PC's are targeting windows, and stuff would be unreasonably small if you plugged in a midrange monitor from the early 2000's. So, monitor manufacturers stopped offering monitors with reasonable DPI.
Most PC's are targeting windows, and stuff would be unreasonably small if you plugged in a midrange monitor from the early 2000's. So, monitor manufacturers stopped offering monitors with reasonable DPI.