The image and status symbol aspect is the dominant factor but the drivetrains have a significant functional difference.
Most high end luxury cars are rear-wheel drive (RWD) whereas many GM and Kia models are built with front-wheel drive (FWD), all-wheel drive (AWD), and some with four-wheel drive (FWD).
Rear hatches, sliding doors, truck beds, etc. are also significant functional differences.
That’s the problem, now it has become a status symbol of one being mentally ill.