My apologies for anyone under 50, this will have no interest to you at all.
I have recently being fiddling with retirement spreadsheets working out whether I can actually stop work now, still survive a bad sequencing risk, live to 106, get dementia, gift half my assets to the Battersea Dogs home, get divorced and re-marry my 26 year old nursing assistant who takes half my assets and then instantly leaves me to die alone and in penury.
I really didn't understand how annuities fit into all of this and did a bit of research which has led me to the conclusion that they are more useful for people with lower retirement balances and require greater protection against sequencing risk, and obviously for all people who wish to hedge against longevity risk - living too long and outlasting your funds.
Intriguingly, the risk of significantly outliving your expected lifespan increases as you get older, which seems counter-intuitive but here is the example:
a man currently aged 60 who, on average, can expect to live for a further 26 and ask: what are the chances of him living twice the expected period, i.e., to the age of 112? The chances are effectively zero. They then consider a man aged 80 who on average can expect to live for nearly nine more years. What are his chances of living for twice the expected period, i.e. to age 98? Answer: about 6%.
The price you pay for certainty is less of a bargain when you first retire than when you are towards the end of your life.
The sweet spot is ~73 years of age. It seems that within average risk tolerances and investment mixes (bonds/stocks) it doesn't make much of a difference to the above calculation.
So maybe for most of us we should swap at least some of our retirement pot to an annuity when we hit 73.
reference: https://cama.crawford.anu.edu.au/sites/default/files/uploads/cama_crawford_anu_edu_au/2023-05/smith_policy_brief_april_2023.pdf (NB this was a UK study, so applicability to Aus and each persons individual circumstance is going to be different)