> Computers screens have gotten wider and wider, and UIs bigger and bigger
Sadly, most websites forcefully limit the width of the text. It's like they pretend our monitors are oriented to be tall rather than wide. Even HN has unnecessarily big margins. So unless I try to cram another window in my FHD monitor, I have ~50% or more completely wasted space. Margins should be 2-3 pixels wide, not 20-30% of the screen.
There are actual user studies to show that wider text is harder to read. https://baymard.com/blog/line-length-readability
The major difference is that in the era of print, it was pretty logical where a multicolumn wide layout could go like on a newspaper, but in an desktop experience the browser markup is theoretically endless.