No, super wrong. Underneath the hood there are all kinds of things that go on and result in system() or similar calls. Think about every module in CPAN / PyPI

No, super wrong. Underneath the hood there are all kinds of things that go on and result in system() or similar calls. Think about every module in CPAN / PyPI / whatever. Any non-trivial Web app has a high likelihood of eventually, somehow, somewhere, causing a system() type call to fire off.