All Websites Look the Same
novolume.co.uk
novolume.co.uk
www.sheldonbrown.com www.toyodiy.com
Neither has got anything interesting in the way of design and I don't care at all. Both of them are completely loaded with content that has been worth (to me) hundreds or thousands of dollars in saved money and effort.
You can differentiate your styling with colors, contrast, sizes, fonts, etc. but you shouldn't use ALL of it to stand out.
Design isn't Art. It should make the entity of its focus more understandable.
Literally everything from cars (colorful sells with engine in front and some seats in the middle, brake is left of the accelerator) to desktops (mother board, 4 RAM slots, 1 CPU slot, USB slots, etc.) to stores (carts out front, role of checkout stands next, isle separated by content after) benefits tremendously from standardization, and are what makes modern life even remotely livable.
I'm of the motherfuckingwebsite.com school of thought--an evangelist for simple design--but I think simple and unique often go hand-in-hand.
Take my industry: newspapers. Ninety-nine percent take a flat-pack, everyfuckingwebsite.com approach. I think that conformity compromises design. Readability should be at the heart of most sites--let alone news sites--yet I find most hard to read for colours, distractions and so on.
The news websites I enjoy are simple and unique--like the Drudge Report and Hacker News, which are pretty much just a list of links with minimal layers. I think that gets to the core of my purpose as a reader: no bullshit clicking around for ages to find what I want/need to read--just here's the news in our view.
For me, that's a big reason for the Daily Mail's success too. Content aside, I think their presentation of news is second to none. You could argue it's like a lot of sites but I disagree: few run tall pictures, nine-deck headlines and so on. MailOnline's production is similar to the way editors put a page together for print. They've transitioned much of the craft online. I think that's how the website retains something of a newspaper 'feel' which most have lost.
Anyway, I should stop writing, I'm going off on tangents and probably talking gibberish, just wanted to chuck in my 2p.
I wouldn't call it "conformity" at all.
It's (extremely) easy to learn and (as mentioned in other comments) its ubiquity means people come to expect it and are already familiar with the UI.
Also, the designers to whom this article references work for clients, who are not the visionaries. And the design agencies job is to make them happy, via conformity.