There is a simple choice in relation to aircraft maintenance:
a) Expensive newer aeroplanes allows cheap maintenance.
b) Cheaper older aeroplanes requires expensive maintenance.
They are both valid options, and both safe, QF in the past has proven this because generally they have always used option b) with success, hence the deserved reputation for engineering excellence.
The current Brain Surgeons in QF Management are trying to invent a third option:
Cheap old Aeroplanes AND cheap maintenance - this will spell disaster and people at the QF coal face have been seeing it, and warning against it for quite a few years now.