the 3DS had it, and lots of other really pleasant UI's had it. Our big office printers at my work have those scanlines all over the UI and it just makes them a little bit less annoying as shit to use. Modern UIs are lifeless, bland, flat, soulless. Fuck optimization and performance benefits, it's not that hard to make a program functional, efficient, and enjoyable to look at with your eyeballs, since that's primarily how you'll be using it.