C++ has a high price in terms of binary incompatibility. Its mangling is (still) complex and fairly non-standard across compilers, which means that libraries are unusable unless you know how they were built and have built them all consistently. Plain C libraries, however, are generally plug and play.

To put up with the pain that is C++ mangling (which I sometimes do), I need to be using major features of C++. If you're only using C++ to make shorter, prettier code that could just as easily be C, you're creating an unnecessarily fragile binary.

Clearly C++ has its advantages, I'm just saying that you should require a lot of those features before accepting it as a language. This is especially true now that C has been absorbing some of the advantageous features of C++, such as inlining.