Almost all business applications have horizontal menus and ribbons that take up a decent percentage of a landscape monitor instead of utilising the “spare” screen space on the left or right, and a taskbar usually sits at the bottom or top of the screen eating up even more space (yes I know this can be changed but it’s not the default).
Documents are traditionally printed/read in portrait which is reflected on digital documents.
Programmers often rotate their screens to be portrait in order to see more of the code.
Most web pages rarely seem to make use of horizontal real estate, and scrolling is almost universally vertical. Even phones are utilised in portrait for the vast majority of time, and many web pages are designed for mobile first.
Beyond media consumption and production, it feels like the most commonly used workplace productivity apps are less useful in landscape mode. So why aren’t more office-based computer screens giant squares instead of horizontal rectangles?
As mentioned, this doesn’t solve the problem of apps not utilising the available space efficiently. “Just open another app” isn’t a solution to “Why doesn’t the app I’m working on appropriately use the available space”.
Because the app you’re working on is using all of the space it requires. It has no need to expand into the unused space.
Web pages and office documents are tall items that already take up as much of the screen as they reasonably can. Perhaps you could move the tool bars to the sides (and many applications do have these options), but users tend to find that cumbersome and that still doesn’t even come close to utilizing that space. Instead they are kept in a format that allows you to comfortably put two documents (or other windows) side by side because that’s FAR FAR more useful than pointlessly expanding the UI.
Except they don’t use the space well do they, as you’ve said. Toolbars, menus, status bars, task bars etc all reside horizontally.
Most widescreen monitors in offices allow you to put two documents next to each other, but still don’t let you see the whole page and remain readable. There’s no question that a taller monitor wouldn’t solve that, because as you’ve said earlier, why not rotate your screen?
I wouldn’t have to if it was taller 😂