Caste systems find their function in strict boundaries. If there wasn’t exclusive traits to one station in life, the combination of fear and desire wouldn’t keep products in their proper places. As something that humans have created for each other, we oft find these systems in play in the products humans create as well.
This of course means that there’s rebellions and compromises throughout caste systems to gain more for the privileged. What does this have to do with an ordinary Oldsmobile sedan from 1964 you may ask. Plenty, when you’re one step up in the prestige sweepstakes, yet see a family rival walking away with spoils of riches.