I run a non-retina 30" Apple Cinema Display right now. There are some blurry text bugs, but that's super rare and I think has to do with me having a mix of non-retina and retina displays hooked up.
But imo the rendering is still pretty good. Unlike on linux where I constantly see incorrect kerning.
macOS font rendering has been worst in class since they removed subpixel-antialiasing. It's now a blurry mess on regular displays.