It's not about
need really. It's about what people
want! It may be doable in a smaller engine car. But not comfortably doable, or at least the buyers don't believe that it is doable.
But Americans also very commonly drive more car than they
need, because that's what they
want. And they often convince themselves that they need them, when they really don't.
Now the automakers both try to fuel this trend, through aggressive advertising and marketing, and respond to what the consumer wants, by watching what works. Even when what works is often what they fought to make work.
Marketing works in the auto world. And automakers would rather sell higher end cars than lower ones. So that's what they push.
Back in the 80s, front wheel drive cars were not common in the US market, and automakers wanted to talk people into buying them. So they very aggressively advertised the 'poor weather traction advantage' of front drive cars until people actually believed in it. When the reality was that they wanted to sell front drive cars because fwd is smaller and lighter than rwd, which allows a more efficient car with more room in the passenger compartment. In the 90s the automakers built the SUV craze off the fact that Americans like big cars, and pushed it hard hard hard, and people started to actually believe that they "needed" an SUV. I was in the car business, and it was surreal to have men who learned to drive in the winter as I did, suddenly claiming that they could not possibly get around in the winter without first a front drive car, and then later a 4WD SUV. And in the meantime, on snow days I got to work on time in my rear drive car, and my coworkers with front drive and 4WD were late.
So, no, it's not really "need". But it is the state of the market.
A number of years ago I had a Toyota Corolla. That car would cruise fine, on a more or less level road, at 70-80mph. But what that car would not do is accelerate up hills or pass trucks in the 40-50mhp range. So off the highways I was stuck behind the trucks, because the car did not have the ability to pass them in the room where passing was allowed.