They seem to see it the other way around. Most things are "hermetic C++" that export only a C interface. Which is to say they tame C++'s complexity not only by

They seem to see it the other way around. Most things are "hermetic C++" that export only a C interface. Which is to say they tame C++'s complexity not only by using a very restricted subset, but also by not letting ~any C++ stuff cross API boundaries.