This is true, but I've found it far more common that a predecessor at the company I'm at wrote the code and isn't around to support it anymore. For simple comp

This is true, but I've found it far more common that a predecessor at the company I'm at wrote the code and isn't around to support it anymore. For simple components it's no biggie, but for non-trivial components it can take about the same time to debug as an external module, the benefit of the external module generally being better documentation, although thats not a given.