Nonsense. Why does Apple have their own plug format instead of supporting USB? Is it somehow better? Easier? Blatantly not. This is just vendor lock in, the opposite of the fundamental ethic of the Internet.
Apple's magsafe and lighting adapter plugs are far better than USB connectors. They are reversible and don't have tabs to break off on the device side.
If you look close at in the connector on this S5 you can see there are two separate 'tabs' that are rather fragile if you are not careful removing and inserting your power cable. I've seen these break on phones before.
http://images.anandtech.com/doci/8554/DSC_1380.jpg
The iphone connector has no small fragile pieces like that.
If you mean accessories like wireless keyboards I think the same 'just works' arguments directly apply. There are lot's of terrable 3rd party products out there.