Comment by kelnos

One silly example: sometimes I'll open up source or config file to make a quick, temporary change in order to test something. But then instead of ctrl+z backgrounding it, I'll accidentally quit vim. Then I start it back up to undo the change, and find that there's no undo history.

I didn't know about persistent undo until seeing this posted here on HN, but now I've enabled it! Of course, turns out it's an unreliable feature on nvim... maybe I'll consider switching back to the original (for that and other reasons).