Sort of Agree,
The local council has a vision of extending the LR from the city to Bondi Junction and Bondi Beach area using the narrow Old South Head Road. At least on the southern CSELR they are actually using the old tramway in the wide median and basically not interfering with traffic.
I think the opportunity to extend the ESR south to the Uni is over, or at least until the LR is fully uterlised and there is justification for a railway to move at least 10,000/hr in peak.
However extension east to Bondi, Bondi Beach and North Bondi (yes likely break a record with four stations in a row using the same part name) is valid. The other benefit is that it would not require 1c to be spent on the existing line to Bondi Junction. No extra trains, no extra staff, no extra track requirements, just extend from the east side of the Bondi Junction Station and build a stabling yard north of North Bondi station while TBM's are cutting the tunnel.
As the line to North Bondi is roughly 4km long, apart from the infrastructure you need around 3 more train sets to service the extension.
Justification is that Bondi Junction station is currently around 6th busiest station in peak on the network and most walk out into a bus going roughly the same direction. After capital cost of building the line, most of those buses would be replaced with just 3 trains, total 6 staff + a few station staff. Removing alot of buses improves traffic.
And while we are at it, the cheapest station to add to the network, Woolahra, finish it. If they want a tram, they'll love a train (finally).