Agreed
The video driver does not control the ability to specify the dot pitch or scale of rendered text and icons, in relation to the rest of the desktop. This is an OS issue. The video card does little more than render what the OS tells it to render. The OS even tells the card how many dots to shove into your monitor, within given limitations.
Scaling has been an issue with Windows. Even when you specify a higher screen resolution (i.e.: from 72dpi up to 200dpi) there are plenty of times when I find that Windows will not scale text under certain circumstances. Sometimes it's messages from the OS and sometimes is something from an application. Either way, scaling has not been so great in my experiences.