[0xTJ]

Fair enough, if that's what you prefer than you might as well, it's more of a personal preference. My main monitor is an ultra-wide, so it ends up using less than 20% of the total width. Though I can see it being tough to have a good solution that works everywhere.

[YuukiRey]

The general recommendation is the keep the measure of the page fairly narrow since studies show that reading text that is very wide is harder than reading a narrower column of text. So looking at the layout from a best practices point of view the author made the right call.