I did not cite Core Data when I argued that Obj-C is a hurdle. I cited Core Data as an example of the fact that iOS frameworks are complex. I also didn't claim

I did not cite Core Data when I argued that Obj-C is a hurdle. I cited Core Data as an example of the fact that iOS frameworks are complex. I also didn't claim that Objective-C is hard to learn. Merely that it presents a hurdle in a way that Java does not - any given developer is more likely to know Java than Obj-C, Java is more widely used and is general purpose language for a breathtaking variety of applications, whereas Objective-C is pretty much only used to Mac OSX apps and iOS apps.