The Homer was a car that Home Simpson built to exactly what they wanted without any tradeoffs for off the shelf components, trends, or sensibility of what currently was common.
It's also somewhat design by committee, with features like a more luxurious bubble for the adults, and a micro-bubble for the kids; presumably so you can ignore anything but the screams or silence.
I also suspect this fictional car might have been an ingredient in the market shifting from minivans to SUVs. Those don't have such great audio isolation but were even taller than the minivans (which were taller than station wagons). Or it could be the 'backup camera' finally reaching a tolerable price level.
The simpsons also did the canyonero: