Earlier quoted context omitted.
When reading text, I believe the opposite to be true. It's why newspapers use relatively narrow columns of text despite having a lot of width to work with. It's much easier to keep my place and process information if I don't have to move my eyes much horizontally. When it comes to scanning for unexpected information, you may be right. A high aspect ratio might be better suited for gaming, at least with games where a…
The problem with both yours and the parent's assertion is context. Newspapers are easy to move so the portion you're reading is in your field of view. Your monitor isn't and it's used for much more than just reading static text. 1.5:1 may be a good reading aspect ratio, but if you need multiple things with that aspect ratio open and on the screen at the same time then you need a wider screen. edit: I just realized a…
I don't find 3:2 to be an especially good aspect ratio for fullscreen text. It's still either too wide or too short, but 3:4 is pretty good, so two columns on 3:2 is two pretty good text areas on a 12-15" diagonal screen. It's also one pretty good text area and some UI, ads, etc... on either side.
I should note that physical size is a major constraint here. On a laptop, I want a column of text to be about 4-6" (10-15cm) wide. A desktop screen that's usually farther away can be a bit wider, maybe 8-10" (20-25cm). Having those columns be very tall is fine. I've been using a 24" 9:16 display for having documentation up while coding lately.