Not practicality for sure! The trunks of at least mid-sized SUVs are small and the trunks of mid-sized estate wagons are quite large. SUVs have a raised vehicle floor, which is terrible for driving dynamics, removes interior space, and adds air resistance.
SUVs are staggeringly stupid vehicles, but fashionable. Personally, I like some fashions, and others I ignore and avoid as hard as I can - SUVs are firmly in the latter category.