By definition, no specialist website or blog is 'representative of the wider community'. A site like AFF will attract those who fly/have flown regularly, those having an interest in aviation as a mode of travel or who wish to commence flying (perhaps their first international flight) and they perceive a need to become more familiar with trip-enhancing or moneysaving options including use of FF points to name a few groups.
IIRC, fewer than 20 per cent of Australians fly regularly internationally i.e. at least once a year (although other extreme is the cohort who make many trips annually, or did pre-COVID.
Are you therefore suggesting AFF mandates that 80 per cent of members or contributors must be Australian citizens/residents who've never flown or haven't done so for a decade? That would be 'representative' but irrelevant to the purpose of this useful blog site.
In passing, Mattg has written some articles recently that have not been complimentary re QF. Yet as usual, they're well argued and his spelling and grammar is impeccable.
New contributors constantly feature in AFF threads including this one. They can hardly be accused of being an 'echo chamber.'
You may not read mainstream media but whether 'The Age'/'SMH' 'Traveller section, or competitors such as 'The Oz', media is full of complaints re QF. Yet internationally to/from Oz, it and JQ combined usually have only a one-third share of total international flight users.
Maybe it's QF itself that needs to 'get a grip' of the complaints and substantively act to at least partly fix, rather than having an individual in charge who sends a soporific email to FF holders and who then (as highlighted by media) goes on holidays while there's the bag crisis at major domestic airports.