The XPeng X9 is a sci-fi-styled first-class lounge on wheels, lavishly appointed and an absolute indulgence to ride in. Some cars beg to be flung around a winding mountain pass, while others all but demand a full-throttle run down an unrestricted stretch of road. The XPeng X9, however, plays a different tune altogether. The moment I laid eyes on it, my instinct wasn’t to grab the wheel, but to slide into the ...