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.
I notice this whenever we go to IKEA or Costco where our sub-$30k Subaru is loaded faster and with less hassle than vehicles costing twice as much.
I even managed to fit enough lumber for three 4' by 10' by 6" raised garden beds in there, trunk to sticking out the front window. That was a little hairy though.
By far the biggest issue is fitting 3 kids in back now that they are bigger, especially if one or more are grouchy. I always take the bigger car if more than 4 people are traveling.
We are all hoodwinked into believing that space in a car is unusual and needs a special kind of car. When actually a well designed small car or coupe can have plenty of space. And adding an extra couple of foot to the size of the boot probably has minimal effect on the manufacturing cost. But that would break the product skews that car companies want to push.
Which resulted in more money for marketing.
https://www.vox.com/future-perfect/24139147/suvs-trucks-popu...
It’s important to remember that Japanese car manufacturers weird absolutely slaughtering U.S. companies in the 80s and 90s by making cheaper, better quality, more efficient vehicles. Detroit has a lot of political weight, however, and when they started pushing far more profitable SUVs as the ideal daily driver, nobody in Congress was going to get in the way by suggesting policies intended to help tradespeople should be modified.
That campaign in the 90s made them popular enough to cancel out decades of fuel economy and safety improvements, and effectively started an arms race where people who never go off-road started to think that they needed to pay more for one, too, because otherwise they’d be at a fatal mismatch in a crash.