Remote stands have been in use since the dawn of aviation; I fail to see the sudden spike in feedback that people don't like buses. We already know this.
You are simply not understanding the argument being made, so I'll need to spell it out.
IF there is a spike or upward trend in negative feedback or complaints
at some time, about remote gates, thefts
or anything, then it would be a poor business that doesn't look into the spike or trend and if its 'real', try to mitigate the issue, whether or not its under their direct control.
Concerning the use of airbridges Vs busses, just say over a period of a few weeks a whole bunch more people than usual complained or commented to Qantas on poor experiences with remote stand boarding at Sydney Airport, I would hope
someone would take note and think - hang on, I wonder what's causing that - what's changed? Have a look and if they can identify the issue, then fix it to what it was before. OR, if they get a flurry of positive feedback - have a look and see what or who has brought this about and then encourage or emulate it.
Not just shrug and say "Well, we've always had boarding at remote stands, nothing to see here."
If they hear about a rise or spike in pick-pocketing in their terminal, in just the same way, you'd hope someone in Qantas takes note, takes it up with the airport authorities to make sure they are taking it seriously, and addressing the issue. Not just say "Ah, someone else will care of it".
But bluntly - its about giving a damn, even if its not your 'fault'. Isn't the standard spiel of any airline "Your safety and comfort are our top priority"?