I disagree with the notion that you have to let go of everything to thru hike as if it's a necessity. This is a common misconception perpetuated by those that organize, or more accurately lack organization and the forethought, to design their thru-hikes to be a positive experience BOTH simultaneously addressing off trails aspects of their life and on trail aspects of their life.
In this age, perhaps at no other time in history, has their been made available ample opportunity to address off trail commitments and responsibilities while on an AT thru-hike. I do it. I've seen countless others that do it too.
There's a mistaken idea that one has to neglect commitment and responsibility off trail while being on trail. These two aspects of one's life can be integrated leading to success in both areas.
Instead of giving greater creedence to stories of how one has to absolutely 'let go of everything' to thru-hike I sincerely suggest giving greater weight to those that accomplish this through their, not someone else's, personal accounting of how they do it.