Apple does the bar because they got rid of the home button, putting the "home" gesture on screen on the bezel-less X.
Google already has on-screen "buttons." These new gestures are not making Android more "accessible." Regular people don't actually do gestures well, especially the elderly. But they do know how to tap a button, and Android has been great at this with their on-screen buttons. Heck, there's a reason the Chinese OEMs were sticking to capacitive buttons for so long, and many accessibility features are button presses (instead of gestures). Buttons are intuitive for everyone, gestures are not. Android also has allowed the on-screen buttons to move away for full-screen apps. So this UI change clearly is there to copy Apple's since there's no real reason for the change on Android. Worse, only the Pixel and few Android One phones would get this, so the learning curve for people to adjust to gestures will take years, if not decades as the majority of Android phones are still on Lollipop and MM.
Google already has on-screen "buttons." These new gestures are not making Android more "accessible." Regular people don't actually do gestures well, especially the elderly. But they do know how to tap a button, and Android has been great at this with their on-screen buttons. Heck, there's a reason the Chinese OEMs were sticking to capacitive buttons for so long, and many accessibility features are button presses (instead of gestures). Buttons are intuitive for everyone, gestures are not. Android also has allowed the on-screen buttons to move away for full-screen apps. So this UI change clearly is there to copy Apple's since there's no real reason for the change on Android. Worse, only the Pixel and few Android One phones would get this, so the learning curve for people to adjust to gestures will take years, if not decades as the majority of Android phones are still on Lollipop and MM.