Just a philosophical point, but it seems to me this type of topic is much like discussing lottery winners who fail to manage their money and relationships and end up broke and alone. Despite the evidence and experts, 99.99% of people who hear these stories or advice think "Well, yeah, that guy couldn't handle it, but not me. I'd be just fine." Many of us hear evidence and advice about post retirement boredom and loneliness, and think, "nope, not me, I've got this". Others have doubts, and are often shouted down.
Now, I don't doubt for a second that Mustachians are a different breed, and maybe most of us will handle the extra 8,9, or 10 hours in the day with no problem, even eagerness. We have some great examples. We also have a few examples of some who returned to work, not out of financial need, but the other benefits.
Maybe gardening and carpentry are Mustachian requirements. Maybe the only acceptable post-retirement return to work is working for yourself. Maybe all of those who go into semi-retirement should find their own forum and community. I applaud those who have it figured out. I even admire them a little bit.
Except those who judge the rest of us. Strength of character? I don't think so. Knowing yourself? Certainly...I know myself. I know what I'm good at and I certainly know what I enjoy. It's not a step back to the lone pioneer, do it all handyman. No, my retirement is about doing what I like to do..and if it takes me a bit to figure out exactly what that is, so be it.