Found on a discussion of version control systems on the TUHS mailing list https://www.tuhs.org/pipermail/tuhs/2024-December/031229.html
See also https://neugierig.org/software/blog/2024/12/jujutsu.html for an attempt on an explanation "high-level enough to read and think about, without providing so much detail that it washes over you."
https://ahal.ca/blog/2024/jujutsu-mercurial-haven/ is an article from a Mercurial users.