Objective-C has added several features in recent years; things like bindings, dot notation, etc. are relatively new, but pretty substantial changes in terms of code clarity.
As for Python 3, the Python community never intended for people to move over to Python 3 immediately, nor was it intended for people to move their Python projects from Python 2 to Python 3 unless they had some reason to (e.g. Django, public libraries, etc).
Objective-C has added things, but it has largely not changed existing things. As I said in another comment, languages generally do not change — they just accrete.
If you feel like a language is missing something, that might be fixable — but if you feel like a language either added the wrong thing or did something the wrong way (which is the OP's concern), that is a much more difficult problem, because after release you can't take away what's already there without making people angry.
As for Python 3, the Python community never intended for people to move over to Python 3 immediately, nor was it intended for people to move their Python projects from Python 2 to Python 3 unless they had some reason to (e.g. Django, public libraries, etc).