But Seatbackforward, there are some DYKWIA sort of Karens/Keiths around too.
QF will have an excuse, oh, its a discriminatory issue to announce that in the current climate or words to that effect.
In the past, decorum would have dictated no one of low status would dare to stand in the premium boarding lane, but these days, I wouldn't put it past a Karen/Keith to give it a try, and probably as you stated, with QF not enforcing it, low status flyers get to board first, and then take up all the overhead luggage space for their "HLO", hard small size suitcases.
Not to mention the suitcase the toddlers can sit on, and can also be towed.
QF has no econX or premY on dom flights, so row 4 onwards, the overhead space is first come first take.
If one family of 3 has 4 items, thats one space they have taken that was supposed to go to someone else.
I have been on flights, where I have had to put my bag about 1 or 2 rows away from me, not good if we have to carry laptops, or things of value in our HLO.
Lucky as of now, flights are quite safe, ie, as of now, we don't have yet have people pilfering HLO of others.