While I share your sentiment to some extent, it's somewhat unrealistic to expect automobiles to be impervious to any size of hailstorm to the extent that they m

While I share your sentiment to some extent, it's somewhat unrealistic to expect automobiles to be impervious to any size of hailstorm to the extent that they may be sold as-new on the showroom floor afterwards. The main issue I believe is the use of relatively thin aluminum body panels to save weight. They could be made from composites like carbon fiber and wouldn't be as vulnerable to hail damage, but that's still a relatively exotic high-cost material.