"And yet, the internet is still having a hard time adopting. Startups slave for months meticulously designing their new marketing site and are completely oblivious that, to people on a Retina display, it looks like a jumbled pixelated mess."

Or maybe they don't care enough about a tiny fraction of their market to create assets at dramatically higher resolution just to prevent customers from feeling a slight amount of buyer's remorse when they look at their display with a magnifying glass?

Maybe they'd rather have pages load faster for all their customers, instead of serving up needlessly huge image assets to every user? It's not like the WHATWG and W3C have solved this problem yet, they're still bickering over whatever the latest solution is (I don't even know whose fault that is at this point, what a mess)

I still find it incredibly hilarious that owners of Retina macs bitch at content creators because their content looks 'pixelated' when Apple is still too lazy to even run a bilinear filter when upscaling the framebuffer. What is this, 1993? Windows has been able to do this since desktop composition was introduced in Vista.