Difference in paint single and 2 stage

Ok, i know that a two stage paint looks the best, or you can get a more "show" quality from it. But what results can you get from a single stage? New cars get single stage, and yes i know theres orange peel as a result, but they do reflect well. Wernt Mopars painted from the factory in a single stage? While my 36 year old paint doesnt have a glass finish, it has held up well. What are your thoughts?