I agree for the most part but up until recently (2016?) I remember that the ViewController life-cycles were actually pretty different. The problem with AppKit

I agree for the most part but up until recently (2016?) I remember that the ViewController life-cycles were actually pretty different. The problem with AppKit vs UIKit is that most of the things seem to be the same until they are not. At that point, you try to hack AppKit to behave like UIKit (probably cause you have some code already written for UIKit) which generally turns out to be a fools errand. For example, I hate the usage of the Flyweight pattern in AppKit. UIKit doesn't suffer from this.