Many of the claims of "longevity insurance" strike me as special pleading. Somebody who had enough income & assets to forego 100% of their SS benefit for 8 years suddenly fears that their independent income/assets will disappear and they'll be dependent on a (higher) SS benefit?
Right now, I expect that my wife will draw her SS at her FRA. I will probably draw at age 70. We do not need the SS to finance our lifestyle.
If we draw before FRA, we will be giving back some of the SS because we still have earned income. After FRA, she/we can earn without affecting the SS payment.
If I pass before her, then my pension benefit will drop to 75% for her. I view the age 70 SS as longevity insurance for her benefit. My pension does not have COLA. Would there be a risk of her running out of money if I pass early? Probably not. But having a plan that shows a larger SS payment makes her more comfortable at this time.
We are roughly the same age, and about 5 years away from FRA. If the rules change, or we feel differently in the future, we can change our plans. It is nice to have options.