Well, the intention of adding `noexcept` is to prevent exceptions escaping from C++ into C.
The REAL problem with exceptions is is when one passes through some C code and back into C++ which catches it and continues to execute. Who knows what state the data being manipulated by the C code will be in since it will never complete its execution.
If an exception tries to exit a noexcept function its an automatic terminate which tells the programmer they screwed up.