In a word, RMDs are the key difference between a Qualified Longevity Annuity (QLAC) and a Qualified Annuity.
A key difference: the purchase of a deferred annuity (one that is not a qualified QLAC but is purchased with retirement funds), only the QLAC takes the value of the deferred annuity out of the RMD computation; a QLAC annuity is not counted when computing Required Minimum Distributions. See our discussions of RMD and QLACs.