TMOS writes "Well, more and more companies are using Linux, as if we all didn't know that. This is one
that utilizes Linux to operate and maintain small to large
telephone systems used by organizations such as the FAA and 911. It is nice to know that an underdog OS can be used to save lives."
Computers are unreliable, but humans are even more unreliable.
Any system which depends on human reliability is unreliable.