This is true. Note that Sydney has fairly unique infrastructure. Sydney has extensive heavy rail that runs from a web of regional areas straight into the city via underground tunnels and this then becomes a circular underground subway system with numerous stops in the city itself. The Sydney system is great. I used to commute 90mins each way on Sydney trains but the fact that I didn't have to change trains to get to my inner city subway stop meant I took a seat, got my laptop out and it became no different to being at my desk at work. A few less distractions in fact. I might be gushing a bit because I now live in SF which has made me realise just how good Sydney was.
Melbourne is similar to SF. They love their above ground trams for inner city transport but those trams do nothing to get people into the city in the first place. The love is pure historical admiration and not rooted in reality. Being above ground is a flaw in terms of adding to congestion and different track gauges and thus train changes is a hassle we could all do without.