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Twitter post by Daniel Feldman (@d_feldman): Linux is the only major operating system to support diagonal mode (credit [Twitter] @xssfox). Image shows an untrawide monitor rotated about 45 degrees, with a horizontal IDE window taking up a bottom triangle. A web browser and settings menu above it are organized creating a window shape almost like a stepped pyramid.
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That's why you should've just handled arbitrary rotations instead of inventing a finite predefined set of orientation "modes" in the first place.
Things get a lot easier in the long run if you aggressively look for commonalities and genericize the code that handles them instead of writing bunches of one-off special cases.
That's called over-engineering for use cases that don't and won't exist. Please lecture us some more though.