No need to rant.
From the Tower the delay between request and actual pushback is very noticeable for Tiger pushbacks. If anything positive comes from this discussion and there is a reduction in delays then this will be a win/win.
Ignorance about the curfew is widespread (not just aircrew). Simple set of rules.
For scheduled jet ops, aircraft must be in receipt of taxi clearance BEFORE 11pm and then can depart from RWY 16R after 11pm (at any time really especially when waiting for the downwind to drop).
Sydney ACD 133.8, Sydney Ground 121.7 & 126.5 will assist you with the curfew but it is easier if you at least have some idea.