Yes the topic has and continues to be covered. But a new year's eve party is always a good place to get perspective. I saw some old friends who have (had) retired over the last couple years with good public pensions... all going back to work. Some sounded like bad planning, others maybe exacerbated by significant personal events (but things you need to plan for when entering retirement).
I did not push for their personal details to understand the retirement failure. One noted he could not get into his retirement accounts without penalties. But since he retired @ 56, I told him that he may be able to tap is 401k. Also that he could tap his IRAs's with a 72T.
So a few retirement failures ... hopefully only temporary. I know others on similar pensions that look like they are doing great... driving BMW's etc.
Estimating spending based on pre-retirement income is missing some critical factors - some of us live above our means and some way below our means. It is critical to get a good estimate of retirement spending that is augmented for retirement needs: travel, added healthcare, etc.
But in the end you will have people who will reduce their spending in retirement and appear to have over saved an others that will increase their spending to the point to exhaust the retirement savings even if they have no unexpected events. This is just part of the emotional side of handling money that we see in everyday life.