"Most people who drive cars now couldn’t find the radiator cap if they were paid to, and that’s fine." That's not fine IMO. That is a basic bit of knowledge about a car and if you don't know where the radiator cap is you will eventually have to pay through the nose to someone who does know (and possibly be stranded somewhere). Knowing how to check and fill coolant isn't like knowing how to rebuild a transmission. It'…
Ironically, many cars don't have radiator caps, only reservoirs. Modern cars, for the most part, do not leak coolant unless there's a problem. They operate a high pressure. Most people, for their own safety, should not pop the hood of a car.
You literally cannot become a legal driver in Poland without popping the hood, showing and explaining random two refillable tanks and oil level check. It’s a part of the driver’s license exam.