It is very clear that all country regulators should act with FAA guidance, with a grain of salt. In the FAA current format.
FAA and Boeing still appear to have a very "protective of each other" cosy relationship.
One would consider that if aircraft have been found with cracking below the inspection cycle limit set by the FAA- the inspection cycle limit needs to be revised urgently.
The FAA were the last to ground the 737 MAX, other regulators made their own decision earlier.
No reason that CASA could not give a 15,000 cycle limit with another 7 day deadline to inspect - if no more cracks are found then great, leave it to upon reaching 15,000 cycles.
It is not a large cost (unless defect is found), increases the safety, no-brainier.
But like Boeing is to the FAA, Qantas is to CASA - what can possibly go wrong?