Am I the only one who hates graphics on t-shirts? If the design doesn't serve a
clear purpose in signalling something about the user, I want it gone. I'm not convinced that we've seen any meaningful advance in t-shirt design since Windows 95.
Ok, ok, I'm being dumb. And yeah, I tend to agree, but as a counterpoint: sometimes it's also just cool to have cool stuff. There is certainly a modernist fetish for superminimalism – HN being a locally favored example of a great social media website with no unnecessary frills – but I think your qualifier "serve a clear purpose" is not objective enough to be a good rule. What you and I think is a clear purpose are bound to be very different. I think a fade in/scaling animation for windows to appear and disappear is a better experience than just flickering them on and off – I think the clear purpose there is that it's cognitively less demanding when a window appears over the course of 200ms rather than 1ms. But hey, that's me.
What is the "clear purpose" of MacOS UI to have rounded corners, or the status bar to be translucent, or for the "genie" effect of minimizing an app. The truth is, animations have almost zero impact on the usability of an app or experience and only add to the perception of quality. Much like contrast stitching on the leather seat of your BMW, the reason it's there is simply because people think it's kinda nice to have and doesn't hurt anyone. Otherwise the only pants we'd be able to buy would be cargo pants... and no one likes cargo pants.
It's OK for stuff to exist that is "just neat".