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I think it's in part related to fractional scaling, which hasn't been sorted everywhere. Text at 4k on a 27 inch is too small to run at 100%, too much of a waste to run run at 200% (equivalent to 1920x1080). So you're running 150% or 175% and that can be an issue if you're running something that doesn't like fractional scaling.

27 inch is perfect for 1440p 100% or 200% (i.e., 5k), but it seems like no one other than Apple has that figured out.

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Yes, fractional scaling is an issue, but I don't think it is as much of an issue as it was a few years ago. In fact, I think the only application that doesn't scale for me is steam currently. Everything else seems to be handled by setting the correct DPI in the xorg.conf and the scaling factor of KDE (150%).

But as this is clearly a software issue, I wouldn't blame the hardware for it ;-)

Since Windows these days handles such scaling just fine, this doesn't seem to be a big deal for consumers.

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