Totally the opposite. Cars used to be delivered with high quality paint, but then the EPA came along and banned those paints. Today the paints are not are good and need extra time to cure.
“…older paints were in fact more durable than the paints we are using on modern cars today because they contained a catalyst, which means they had a chemical structure. In other words they dried through a chemical reaction rather than mechanically by air. These paints could not scratch, they could not peel, they could not chip, and they went on in three or sometimes four layers or even way more. Single stage in fact means you have more quality pigment on your car. The pigment defined your car. How do I know it was scratch proof? Scratching layers of paint off the car is how you brought back the shine of the car. That is why wool pads used to be the norm. The more you scratched off the more your paint would shine. This is where I will bring up the car wash as an example. Today they tell you not to bring your car through the car wash, they say a car wash will destroy your car and eat away at the paint. That used to be the point.”
If you want to do more reading:
When Paint Jobs Lasted Forever: The Lost Art Of Single Stage