it's a matter of the probability of $X writing good code in relation to the probably of oneself writing good code.

True, however, if you can't understand the code, should you really be using it? How maintainable is the code if only Damian knows what it's doing? What's to prevent Damian from taking advantage of his vastly superior knowledge and inserting code that will turn my processor into a nuclear weapon and holding the world hostage until they pay him the sum of 1 Million Dollars! I mean, look at his picture, he's evil. EEEVIL.