I love when people bring up the kei truck argument. If all you do is haul mulch around town from Home Depot, by yourself, and you already have another car, sure, go for it. But pretty much nobody owns a key truck as their only car. There's little crash safety, your knees are the crumple zone, they're not designed to go on 70 mile interstate highways, you usually can't transport many people. I would feel uncomfortable transporting friends/relatives more than a few miles on low speed roads in a kei truck, because they're 25+ year old designs focused on size rather than safety.
A kei truck is a supplementary vehicle at best... so you'd still want a car, and then you have two vehicles. Lots of people don't want two vehicles when a single vehicle that covers both use cases exists.
Sure, nobody needs a gigantic beast, but for people in lots of parts of the country, the downsides to owning a larger vehicle aren't that big. Why buy a smaller pickup truck when a full size truck is just a few thousand dollars more (in a country where the average new vehicle sells for $50k), gets similar fuel economy figures, and has more room in general?
A kei truck is a supplementary vehicle at best... so you'd still want a car, and then you have two vehicles. Lots of people don't want two vehicles when a single vehicle that covers both use cases exists.
Sure, nobody needs a gigantic beast, but for people in lots of parts of the country, the downsides to owning a larger vehicle aren't that big. Why buy a smaller pickup truck when a full size truck is just a few thousand dollars more (in a country where the average new vehicle sells for $50k), gets similar fuel economy figures, and has more room in general?