INDIANAPOLIS — I have long been a fan of the Mini, a fun little zipper with classic British looks that can fillet cars way above its weight class. About ten years ago, my family even bought a first-generation Countryman crossover. It was underpowered, but drove like a BMW, got good gas mileage and had the best Harman Kardon audio system I’ve ever heard. It became too small for our growing family, so it had to go. I wonder if we would have made the same hard choice if we owned the 2021 Mini Countryman SE ALL4 “plug-in.”