The cool aero effect of the handles comes with a small learning curve. For the week that I had the Model 3, every new passenger had to figure out the idiosyncrasies of the car’s doors. It’s Vulcan-esque handshake in which you press first with your thumb and then grab with your fingers. It only takes a few seconds to figure it out, and then you’re fine. That said, Tesla’s clever designers could concoct an even easier flush handle for the next generation of EVs.