1080p at 13.3" will require a different scale factor than it will at 27". Fractional scaling isn't about this resolution or that resolution... it's about the combination of resolution and physical size--the DPI/PPI value. And monitors have wildly varying DPI, from good ol' 96 all the way up to 300+. Furthermore, even if you are fortunate enough to have a screen that was designed for 200% scale, preferences regarding size and density vary. Members of the the "only integer scaling exists, buy a better monitor" crowd need to join the real world.
For these reasons, supporting fractional scaling is important, and Plasma 6.0 actually includes a very large number of improvements for fractional scale use cases. Personally I'm daily-driving a dual-screen setup with a 4K 14" screen at 225% scale plus a 1080p 27" screen at 110% scale, and it's totally boringly usable with the apps I use.
For these reasons, supporting fractional scaling is important, and Plasma 6.0 actually includes a very large number of improvements for fractional scale use cases. Personally I'm daily-driving a dual-screen setup with a 4K 14" screen at 225% scale plus a 1080p 27" screen at 110% scale, and it's totally boringly usable with the apps I use.
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