I think the right intuition to have with jj is that `jj st` should show an empty change unless you are actively working on something. `jj commit`, as mentioned below, is a good example of this - it automatically creates a new change and checks it out. The "squash flow" also does this well - you use the branch tip as a staging area and squash work into other changes on the branch as you go along. Either way, once the work is finished, there's an empty change at the tip of the branch.

This is also supported by jj implicitly - whenever you check out a different commit, if the change you were on is empty, has no description, and is the tip of a branch, it's automatically deleted to clean things up for you.