> About the closest thing we have to a "normal" desktop dpi nowadays is probably 24 inches @ 1920x1080, which is ~92dpi.

Funnily enough, 96dpi is actually the reference that Windows uses. 200% scaling factor is therefore 192dpi, and 250% is 240dpi.

Explains why Windows defaults to 250% scaling on 15" 4K monitors, like laptops. Or 125% on 15" 1080p monitors!