I assume it's a reocurring thought that maybe the commenter you replied to only got in because of the standards being lowered.
Which is something I have heard of from quite a lot of people who may have benefitted from AA. And it's somewhat frequently paired with a huge amount of self doubt.
I was happy to write an essay about my experiences growing up on a farm for my Harvard admission packet. I couldn't care less about whoever hypothetical NYC chess-playing salutatorian I "beat out".
ISTM these "special" circumstances very rarely contribute the bulk of any incoming class. Any "regular" student who really deserved admissions got it, and only marginal strivers with few must-have qualities complain about getting denied in favor of applicants with special circumstances. It's fine for these people to suggest larger class sizes (certainly in the case of Harvard they are correct; I don't know about the Australian system). Their self-interest is showing, however, when they start making lists of people whose test scores they beat by a few points. There's no reason to trust their judgments over those of professional admissions staff.
That is doubly the case for those of us who may have been admitted for these reasons and then went on to collegiate success. Why the hell would we worry about the opinions of those marginal strivers? They should do their best at their safety schools.
Which is something I have heard of from quite a lot of people who may have benefitted from AA. And it's somewhat frequently paired with a huge amount of self doubt.