I am not a financial expert, but the way I see things, if you can arrange that social security and pension/annuities cover your basic living expenses, that is a great thing. Then that means you are protected from ups and downs of the stock market, not needing to draw down or reduce the amount you are taking out, letting it grow, or deciding what you want to do.
Just as people try to diversify risk in a stock market portfolio, I think diversifying risk (by paying off house before retirement, by using annuities, social security or even rental income to cover basic living expenses) is great in that it all does not hinge on current stock market performance. I am hoping/planning that what is in my retirement investment account will cover about 1/3 of my living expenses. I like the idea, that if everything goes south, I could probably survive off what I am getting with projected ss and pension funds when the time comes. So if things are more pessimistic, I can use the investment fund, or live more simply. If it is more optimistic, I can go on more trips or help my children more.