I use the staging area to allow me to more easily break larger changes into smaller commits. I am usually all over the place while writing/refactoring code and making commits as I go along doesn't work well.

How does sapling let me take a long list of commits and break them into larger but more manageable chunks?

git add -p allows me to add chunks easily and create commits, git commit --fixup allows me to mark a commit as fixing a previous commit, and with git rebase -i --autosquash I get to easily take those fixup commits and meld them into the previous commits.

Also reviewing a stack of patches is annoying in many cases as I care more about the end result vs each individual commit. But that may just be my experience talking in open source where I am working on smaller but better well defined projects vs a large mono-repo where there may be a lot of changes across many disparate parts of the code base that make it difficult to look at the "whole" vs a patch that is more localized.