User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-24703334-20150416025615

I understand the purpose of improving readability of contents, especially with light size typography, but after viewing the before and after results on my own configuration, it seems you miss the point: I'm usually on a 16:10 resolution with 1920 width, so i'm in desktop XL case: The MAIN body content now represents less than 1/3 of the total screen width, barely 1/4. It results in endless scrolling on pages with huge contents, making it hardly to find a specific information into. Most of the people don't visits wikis for "reading" full article as you read a book, but looks after answers and specific contents. With this change, this make it harder to find it, and make use of TOC barely essential even with few contents pages, wich adds longer pages again... Even with an infinite scroll without clicks on my mouse, I will not reach Category bottom page in a scroll down. Do you really think users will bother with, and take twice the time to find after what they try to reach?

This change makes too much space waste, double the page's vertical length, reduce content search efficiency, finally makes the main text content painful to read. Too much vertical scroll is a bad thing too, review your Fitt's law. Plus, eyesight need to refocus much more. The average resting point of convergence is 35° at 30 degrees down angle, 45° at horizontal, and 53° at 30 degrees up angle. This data offers a significant justification for lowering height over width. You make the reverse of good ergonomic practice.

I'm not using a XL wide screen for having same UX as tablet/phone users you know...