There is one weird anomaly in Australia where there is a death tax by stealth and that is superannuation.
If you die with $500k in the bank you can via your will leave it to anyone and the receiver pays no tax as its is treated as post tax income (of course they will pay tax on any subsequent interest they earn).
But if you die with $500k in your super account and don't have a dependent spouse or dependent child (per the ato definition no longer considered dependent once 18) and want to leave that $500k to you adult child or sibling or friend then they will have pay tax on the portion over $200k (the amount of tax is dependent on their other income).
This stealthy death tax discriminates against those without dependents; and is BS are you have paid contribution tax on that super and also earning tax on that same super whilst in the accumulation phase and you didn't have a choice as the govt forces you to have super.
Personally I dont think parents owe their adult children any sort of inheritence, Im fine if my parents need to sell or reverse mortgage their house at some point to live a decent lifestyle as they age further. They have wills, advanced care directives, POA and pre-paid funerals in place which is great; if there is nothing extra left for me and my siblings so be it.