Apple may have popularized the top notch with the iPhone X, but it was the Essential Phone — the brainchild of Android co-founder Andy Rubin — that first brought the idea to public attention. In an effort to maximize the device's display, the Essential Phone features a top-notch to house its front-facing camera.
However, the smartphone released with Android 7.1.1 Nougat, which is not optimized for the top-notch design. This left several applications unable to expand around the notch and ultimately truncated the overall width of the usable screen, the opposite intent of a full-screen design. The current Android 8.0 Oreo software, which released after the Essential Phone hit the market, was similarly not optimized for unique smartphone designs.
The iPhone X has a similar issue in that not all apps are optimized to wrap around its top notch. Like Google, this may be a pain point that Apple addresses in a future software update.