The Tesla Model 3 and its crossover sibling, the Model Y, don't have physical buttons for most features. Owners need to rely on the central touchscreen to perform even the most basic tasks. A new third-party addon aims to fix that by adding a factory-like button bar under the touchscreen. Tesla's infotainment system is probably the best out there. It has buttery smooth animations, a well-thought-out interface and, more importantly, it just worksunlike some legacy automakers' systems, which sometimes need a reset or two to work properly. That said, Tesla's obsession with simplicity resulted in an unfortunate casualty: no buttons.