Consider problems as a Poisson distribution. If you eliminate problems, there will be infinitely many more, but they will be rarer and increase the overall stab

Consider problems as a Poisson distribution. If you eliminate problems, there will be infinitely many more, but they will be rarer and increase the overall stability of the system. Once you eliminate so many errors that the mean time between failures is greater than (say) 100 years, that's basically equivalent to having a bug free system since the system will almost certainly be retired before then.