Surprise: The Google Pixel 2 has a hidden menu button on its navigation bar
The menu button used to be oh-so-important to Android in the early years. Google ditched it pretty early on with the introduction of the Galaxy Nexus, but Samsung's flagship Galaxy Note III was released in late 2013 and still had one on board. But even after menu buttons lost their permanent spots on the chins of phones, some still persisted through long-presses of the multitasking button. You could even find cheaper devices with dedicated menu buttons to the right of their multitasking buttons...