It's simply an indication of "progress."
Once upon a time, in an era which is now a misty memory, the web was used as a method of freely sharing information. Content was king, and web design reflected that by attempting to make sites with clean layouts and navigation, so that the content wasn't obscured by graphics, or animation, or some bizarre navigation scheme. Displays were (much!) smaller, so one had to carefully weigh how much "stuff" could be on one page. Looking back on it, that web was a very aspie thing - pretty much everything you looked at was someone's special interest, put on display for the world to share.
Now, the web is viewed as a marketing tool. There are vestiges of the ancient "content is king" and "information wants to be free" memes on educational and individual sites, but mostly content is used to draw eyeballs to a page which is calculated to display as many ads as possible, rather than to maximize the content. Go look at a "news" site. Is most of the available screen used to convey news, or is it devoted to ads? Is it obvious which links are ads, or are they blended in so that you don't know if you're going to a related story or a site selling something until after you click? How many times does an ad pop up OVER the content, requiring you to click it before you can even see the article? How many times do you have to click "next" (and view an entirely new set of ads) to read an article that wouldn't fill one page in a magazine? I do realize that news organizations cease to exist if they stop making money, but . . .
/rant