A version of operator<< that returns ostringstream instead of ostream
Bjarne gives a pretty succinct description of why this (and many similar) features aren't in the standard. He points out that virtually everybody who talks to him about C++ has essentially the same thing to say: "C++ is way to big and way too complex. You should really work at making it a lot smaller and simpler. Oh, but while you're at it, you should add this one really great feature I thought of"

It kind of reminds me of things I've seen about how questions of political polls can be/ are phrased. If I ask: "Do you think this country should do more to [increase jobs | help the needy | etc.]?" I can count on a large majority of people saying "yes." If I ask "Do you think we should raise taxes by X%?", I can count on an equally large majority saying "No". I can give nearly a guaranteed outcome from my poll just by choosing whether to ask about the hoped-for outcome or the cost.

Bottom line: Each feature you add has a cost, and focusing on the outcome doesn't remove the cost. To design a usable language/library, you need to restrict features to the few that provide the greatest positive outcome for the lowest cost. In the case of the C++ committee, they've been pretty clear about a few things, and one is that most new features will barely be considered at all unless they enable fairly substantial improvements in code that uses the new feature and have extremely minimal cost, especially in terms of breaking any existing code.