>That's probably true in a select case, but this is why you use libraries in Python - to make use of all the hard work that already exists in C/C++ in those libraries, with Python serving as a high level and far easier to write functional wrapper.

Yes, but that's also the issue they address. That you cant just write plain Python for something not covered by libraries and have it be fast. You need to then mess with extending with C, Cython, and so on.