How about 2:1... So "work" that the monitor's stand will be a steel-toe boot!
There is a problem with ratios beyond 16:10 to 2:1, the problem is vertical real size, horizonal view can be always expanded in horizontal adding more screens as it has been doign for ever, but expanding vertical size is impossible.
And it doesnt matter how wide the screen is, there is a minimum vertical size that screens should have in order to be productive, and a 27”iMac vertical size is barely enough, AE, premier, Maya, Animate and many many animation or video editing software timelines demands more vertical area, having tools at the far sides in a 2:1 in Photoshop doesnt help either.
2:1 in 27” screen is a gamer ratio,
To be a production ratio, vertical size would need to be big enough, so a 32 or bigger screen would be necessary. Moreover, macOS is not ready for a 2:1 screen as organizing windows would be a real mess, always manually as you cant snap windows to the sides to mimic to screens together, macimizing windows in finder or webrowser would end in very awark full screen
