Over the last 30 years QANTAS has outsourced maintenance to various company's, it has never gotten a good result. From United in the 80's, EEI at Singapore, the Ugly sisters, cheaper has never been better.
QANTAS engineers may not be God's gift to engineering but they are pretty good, what they can't do is paper work to satisfy FAA and EASA, eg BA repairs to a/c after engine failure and ATLAS repairs. Nothing wrong with the repairs only the paperwork was f
ed. Overseas MRO's know how to pander to these organisations to keep their authorisations, QANTAS doesn't!(Don't call an FAA inspector a piss head when he is teetotal, alah Robbo!)
As long as the bean counters can see a saving on the bottom line a/c will continue to be sent overseas. When they finally add up the cost of an overseas check and the repairs afterwards they may finally see that it is more cost efficient to do it at home, I don't see that happening in a long time, by then it will be to late.