Sort of, the metro line started with Epping to Chatswood (that’s how I see it anyway) which to be fair is still fairly rich. You’re right that north Sydney to brangaroo are like the rich rich area.

There is more lines coming though, one from Westmead (west) to the city, and another way further west (st Mary’s) to the new airport line.

You’re right though, that west doesn’t always get the best. And as someone who used to work city to Chatswood the train was typically better and less issues then when I worked out west (Parra).