PALM SPRINGS, Calif. – BMW once advertised its vehicles using the tagline “the ultimate driving machine.” They no longer do, unfortunately. Is this a subtle admission that modern BMWs aren’t the ultimate driving machine? Hardly. As exhibit A, I offer you the 2023 BMW i7 xDrive60. Deconstructed, the “I” means it’s electrically powered, the 7 means it’s a 7 series, and the xDrive is for all-wheel drive. What does the 60 mean? Beats me. But all you’ll need to know is that this 7 Series, part of a redesigned 7 Series line for 2023, is a pure electric powerhouse, a slab of Bavarian luxury ready to …