[vbezhenar]

I'm using modern IDE and 32" 4K display yet I still support this rule. One example where it's particularly convenient is 3-way merge. Also if we're talking about IDE's, they often use horizontal space for things like files tree (project explorer) and other tool windows.

[masklinn]

And on a wide display it's very convenient to use the width to put useful ancillary content on there (e.g. docs, company chat, ...). I shouldn't waste half my display on nothing because you won't add line breaks to your code.

Annoyingly lots of modern website have very wonky breakpoints / detection and will serve nonsense mobile UIs on what I think is reasonable window widths e.g. if you consider bootstrap's "xl" to be desktop then an UWQHD display (3440x1440) won't get a desktop layout in 3 (to say nothing of 4) columns layouts, nor may smaller laptops (especially if they're zoomed somewhat).