Public transport in this area is indeed less attractive if you have any other form of transport, particularly if you live on one side of the ACT/NSW border and commute to the other. Google reckons for example that it'd take me a bit over an hour to get to either of my usual work sites on a bus compared to the 15-20 minutes it takes me normally.
Not mentioned (like usual) is motorbikes as an alternative to cars. The space advantages when it comes to both on road and parking are obvious compared to the usual one person per car (and they use less resources to make, particularly when it comes to EVs) so you'd think anyone actually worried about congestion would do more to encourage their use.