You truly have no idea what you are talking about, do you?
Doesn't take long for the apologists to come crawling out of their holes does it?
Suggest you take a long look in the mirror and then ask yourself who "has no idea what he is talking about".
"Risk" is for beancounters, "Preventative Maintenance" (or interval-based maintenance) is for Airlines. the current "Fix on Fail" mentality of Qantas is what is causing all these problems that never existed under the past maintenance schemes.