Buick has transformed itself into an all-SUV brand in the United States and the 2021 Envision is all-new. It’s a two-row crossover positioned between luxury models like Audi Q5 and mainstream vehicle like Toyota RAV4. Available with a electronically controlled twin-clutch all-wheel drive system that directs power not just front to back, but also between left and right rear wheels, it arrives just in time for Seattle snow. Tom Voelk checks out the system and everything else about the Envision.