As objective-c is a true superset of C, it is a much more effective and ergonomic system language -- interfacing with mach, Posix and Carbon APIs -- than Swift in my experienced opinion.
I agree. I wish the Free Software crowd had adopted it - they sorta did with GNUstep - but unfortunately it doesn't receive the attention it deserves. Anecdotally I've noticed many C and C++ GUI frameworks, like Gtk and Qt, reinvent the dynamism of Objective-C in some way or another (signals/slots, property bindings, etc). The whole GObject system could have been a GNUstep alternative.
