alt Hacker NewsAll of these involve external monitors as far as I can tell, so it seems more likely it's the Display Stream Compression mentioned by the sibling to your comment that is the culprit.
Like I said, absolutely nothing like that happens on my display. I see the ringing in the first link. That doesn't happen to me. Not even a hint of it.
I get you don't like the scaling, but like I said, the very slight blurriness just isn't really noticeable in practice, especially given how Macs antialias text to begin with. Of all my complaints about Macs, this particular one is close to the bottom.
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> All of these involve external monitors as far as I can tell
This happens on the native displays of MacBooks and iMacs, too. Try any of the 'looks larger'/'looks smaller' settings and it'll show up.
I gotta say, as the guy who brought up DSC, that last Reddit post especially had me doubting. That is not what DSC artifacts look like. DSC subsamples the chroma, which causes distinct color bleeding issues. That is luma bloom, which doesn't happen with DSC.
So I took my Mac Mini, hooked up to a 4K monitor, verified there were no DSC artifacts at native resolution, set it to "2560x1440" and sure enough the same artifacts appeared for me too, but still no telltale signs of DSC. So yeah, I gotta say, this is on Apple. Between this and dropping subpixel antialiasing support for text, it's pretty clear that their only properly supported configuration is 2x scaling on high-DPI displays.