It's even more important for web design. Give me simple HTML with a touch of css, and javascript only if it's absolutely necessary. I can think of hardly any websites that I would consider "beautiful" these days for exactly this reason.
http://idlewords.com/talks/website_obesity.htm
http://www.webdirections.org/blog/the-website-obesity-crisis...
PS: I'm not sure I would classify these sites as brutalist; perhaps 'utilitarian' or 'functional' would be better descriptors.
A lot of websites we're making nowadays are HTML/CSS with a touch of javascript out of necessity since nobody wants to just use some wordpress template or have it look like every other AngularJS webapp. It might just be the particular sort of sites I stumble upon or my strict adblocking though.
But I'm not sure it could ever be fully 'mainstream' since there's enough people (particularly older) that need big buttons and familiar design to browse the web. But for smaller sites that cater to generally younger people, it could take this direction. Only time will tell!
PS: I agree that it really isn't brutalist, but there really should be a better word to describe this sort of aesthetic.
... I began by replacing the image carousels with pictures of William Howard Taft, America's greatest president by volume.
If you go on designernews you'll see small portfolio sites that require a motherfucking loading screen.
I made my little site (albeit not very portfolio oriented) because I could convey what I wanted to in that way, and I hope to encourage others to reassess what they're actually conveying and what they need to do so effectively. Usually not a loading screen.
(I know Nginx can cache things, this is just an example)
All of those sites have been around forever (in Internet time), and they all rake in tons of money, despite their lack of (indeed, willful indifference to) trendy design esthetics.
Someone mentioned drudgereport.com above. That's just plain black text on a white background. It has an Alexa rank of 130.
But many is not all. If they were designed to be beautiful as well as functional, they might well see a bump in transactions.
The reason they don't is either deliberate branding (Drudge, I'd guess) or incompetence (eBay), or because it's not obvious the bump in traffic would be worth the expense and time (Amazon.)
And also history. When you've been around as a brand for a decade or more, you don't need shiny.
But it's really not a good plan for a startup to have an ugly site now unless it's making some kind of ironic retro point about itself.
More people would visit, or people would just buy more when they were already visiting?
I find it amusing that some of the most popular sites are considered bad designs by people who think they have all the answers to web site design (at least, they're getting involved in this season's look), whereas the sites which apparently demonstrate good design are ugly, less pleasant to navigate, and harder to extract information from.
They might also see a drop. Existing users might be confused or upset and leave. The site's performance may suffer. Blind people might hate it. Bugs might surface. Tools might fail.