https://medium.com/tall-west/no-cutting-corners-on-the-iphone-x-97a9413b94e

When the iPhone X launched, a lot of designers were put off about the screen shape. Those complaints have mostly died down, but I haven’t seen much design-nerd talk about cool corner treatment details. Fortunately, deep nerd shit is my specialty.

When you’re starting a design like this, the obvious, and comically cheaper option is to make all corners square. Machines exist and/or are calibrated to make those screens, so keeping edges squared requires fewer manufacturing changes and less talent along the pathway to production.