Android Ice Cream Sandwich was the first version of the operating system to introduce virtual navigation keys to phones, allowing manufacturers to dismiss physical ones. Although some decided to wait much longer to implement these, — I'm looking at you, Samsung — almost all Android devices nowadays have finally abandoned traditional buttons in favor of on-screen input. With the introduction of the iPhone X, Apple wanted to maximize screen space and therefore designed an ingenious swiping-based navigation system, that didn't require the need for buttons. With Pie, Google took its stab at it, but didn't quite make up its mind between using keys or gestures and instead went for a combination of both.