I think you fundamentally mischaracterize the intent of the standards committee's additions to C++: a large part of the changes introduced from C++11 on are intended to simplify use of the language. Yes, it does take the form of additions, because legacy codebase support makes it hard to remove old features. But the intent is to take user code patterns which accomplished something either indirectly or via hacks and make the code declarative. Yes this does put more responsibility on the compiler, but will bring long-term benefits. "Must implement this intentionally designed feature correctly" versus "must replicate this historical accident of behavior exactly".

I think that's what bothers me about your comment; your phrasing "continually stuff more features into the language" implies a short-sightedness, but if you actually follow the work of the committee you can see that the thinking all the way from when it was C++0x to now maintains a long-term view.