[chc]

A language that is constantly changing in fundamental ways is not usable for serious software. Languages are largely constrained by the choices that were made when they were released. See Python 3 for an example of what happens when a language tries to make breaking changes — and Python's were relatively minor! No language could thrive while going through that sort of strife constantly.

[danudey]

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).

[chc]

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.