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Sub-pixel aliasing has Not been removed from Mojave
MacOS Mojave looked bad for me on my non-retina Macbook Air. The consensus everywhere I looked is that it has been removed from Mojave, there are many pages describing this if you do a Google search. However, the feature has not been removed, just hidden.
It can be enabled using the following terminal command:
defaults write -g CGFontRenderingFontSmoothingDisabled -bool NO