I agree with that...I was thinking like the iMacs and external displays for 16x9.
The 20-30" range I'd go with 16:9, but beyond that I think you get more benefit from additional width than additional height which is why I'd love to see something like 34" UltraWide 4K monitor.
Personally, I want Apple to start using much larger displays (on the diagonal) because I'd like large desktop displays move to an aspect ratio closer to CinemaScope.
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The 20-30" range I'd go with 16:9, but beyond that I think you get more benefit from additional width than additional height which is why I'd love to see something like 34" UltraWide 4K monitor.
edit: LG has had a 29" 21:9 model for awhile but that makes the height of the display too short, IMO.
I'd like a square 30" display.