Seems to me we've got a slight design lag with browsers and other utility programs.
Even as far back as 2000, 3D computer games were extremely common and becoming the norm.
Still, today the world of programs and websites is primarily flat.
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I'm aware there are technical limitations at work here also, but in a world where browsers can take 90% of a CPU's processing power just to run a few BS plugins, this seems like a fairly fatuous excuse.
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What if the primary psychological appeal of things like Youtube and Twitch isn't the content (which is often pretty shit), but visual depth?