This is somewhat true. However, any developer who's got even the smallest amount of development skills will be able to make the leap from Obj-c to Swift with r

This is somewhat true. However, any developer who's got even the smallest amount of development skills will be able to make the leap from Obj-c to Swift with relative ease. Most of what people end up learning when doing iOS/Mac code are the frameworks, and they're functionally identical (except for syntactic difference of course).