I think what happened in Australia is that there was a rush to issue Part 141 certificates to people rather than implement an 'independent instructor' regime. Others in the training system may have a better recollection than me.
Whether that needed to happen? I don't know. It seems to me - even just from the regs I quoted above - that the regs expressly contemplate that some activities - including flight reviews - can be carried out independently of a Part 141 or Part 142 operator.