In the UK this is actually the typical pattern for defined-contribution schemes; I haven't looked recently but it used to be the case that you were legally required to buy an annuity with 75% of your tax-deferred retirement savings.
Interesting. I'm not sure how common annuities outside of defined benefit pensions are in the US. My impression is not very.
I've noticed them mostly in the form of charitable trusts (which can offer the benefit of basically shielding large asset gains from taxation). But it doesn't seem to be a widely-used investment strategy in general. Maybe it's more common if someone doesn't have an interest in passing down any money.
