Earlier quoted context omitted.
Maybe my perceptions are out of date, but cleartype, while technically allowing higher font dpi, had a rainbow/screen door effect that stood out like a sore thumb for many of us.
The effect depends on the screen technology you use. Windows guesses the pixel layout, but you can tweak ClearType to fit your screen better. You can open a wizard that takes you through six steps and asks you to select the rectangle with the best text (out of six rectangles) to tweak it to your liking. When the subpixels don't align, ClearType can be ugly as hell, but for me the default guesses always worked out.
OK, I played around with it and I was able to make it more and less noticeable depending on which boxes I picked. Guess I'll never know if that was possible when I first started noticing it 20 years ago, with worse monitors and better eyeballs :(