The permanence issue is exactly why I chose to hang.
I have stretch marks on my chest/shoulders from weight lifting that will never go away.
The stretch marks are scar tissue - they will never go away, but the size does. I have stretch marks all over my pecs, delts & upper arms. I was massive then. I still have the stretch marks, but I ain’t massive no more.
Furthermore, the hanging doesn’t address the girth issues. My EG, midshaft, is almost 1/4” less than it was last summer - and I still PE! The losses were due to my shifting my focus to stretching, for length. I still did some jelqs, but not the massive counts I used to do. I still hold about 6 1/8” EG, but that’s nearly 1/4” down from before. Another such loss and I’d be under 6.