My Uber dropped me off in front of a modern mansion in the Hollywood Hills. The road up the hill is steep and twisty, and it's littered with multimillion-dollar homes that twinkle as you look past Sunset Boulevard below. The host who received me told me beforehand to call for a shared car as it is difficult to find parking spaces nearby. It's true: the narrow streets are already parked with Ferraris, Teslas and Lamborghinis owned by nearby residents and early guests. My sunken Honda...