Apple is heavily involved with the design of many hardware components. The iPhone isn’t simply a collection of off-the-shelf parts. They wouldn’t be able to design their products the way they do. Then there’s also the software side of things.At Apples OLED native resolutions they probably wouldn't need to turn them down so one might argue they’re perfected for Apple?
Anyway my real point was that Apple don’t perfect anything as they buy everything in and so someone else is always perfecting