Sure but you said that when viewing documents side-by-side a 16:9 would give you more space, when really it's the same amount of pixels, and a trivial amount of physical difference (less than an inch on a 27" panel).

I was just clarifying that this is technically true but not really a noticeable difference on that axis.

> the actual width (inches) is still bigger on a 16:9 (for the same diagonal).

That's hypothetical, they don't have the same diagonal in the real world. (e.g. 15.6" laptop displays are 16:9 while 16:10 ones are 16", and they have the same width after all http://www.displaywars.com/15,6-inch-16x9-vs-16-inch-16x10)