I actually understood the one-button mouse idea recently. It forces software developers to try not to hide all the useful features behind right-click menus, but figure out how to consistently lead a user to where they want to go.

User Story: My wifi wasn't working on my windows laptop the other day, I knew there was some nice "troubleshoot network" button, but I could not find it for the life of me every time i clicked on the wifi icon, causing me to go through the "network and sharing center" menu . 10 minutes later I finally realized right-clicking instantly brought up the troubleshoot menu.