And you make a good point as well—most PC users have had no exposure to 220 ppi displays (5k@27"), and are perfectly happy with 160 ppi (4k@27"), so aren't even going to be motivated to consider a 5k.
It's probably partly because Windows handles non-integer scaling SO much better than macOS
and also this:
Windows looks better at 164 ppi than macOS does, because Windows has subpixel antialiasing, whereas macOS does not.
Apple removed this feature after all of its pro machines went Retina, making its non-Retina machines actually look worse than they did before.
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