There has been a lot of progress made in computer monitor design lately. They have grown bigger, and at the same time, wider. That’s great for video editors, desktop publishers and animators. For web programmers and app developers, though, not so much.
Take a web page for instance. Viewing it on a widescreen (landscape) monitor may allow you to super-size it, but at some point you’ll have to spin the old scroll wheel to see the rest of the story. Web pages are meant to be moved up and down. A wide monitor may let you view multiple pages side by side, but you will still have to scroll.
Web pages are meant to be viewed in an upright, vertical (portrait) position. They are the digital equivalent of a newspaper. How are newspapers presented? Portrait. Sure, you can open it wide and put two pages in your field of view, but you still have to look up and down to see all the content.
A monitor that can turn to portrait mode may have more benefit for your workflow than you think.