Because it sacrificed pixel accuracy - the horizontal lines were a continuous signal and the pixels kind of blurred into each other. Looking at a CRT monitor si

Because it sacrificed pixel accuracy - the horizontal lines were a continuous signal and the pixels kind of blurred into each other. Looking at a CRT monitor side by side with a LCD one was quite revealing - even a last generation 2005 CRT monitor with digital controls and OSD was a blurry mess. If you want both fast refresh rates and pixel accuracy, well, you kind of need today's technology. Not possible back then.