I also like `jj commit [paths]` to commit just a subset of files when I don't need hunk based splitting.
Like `jj commit -m 'Feature A' file1 file2` then `jj commit -m 'Feature B' file3 file 4`
Like `jj commit -m 'Feature A' file1 file2` then `jj commit -m 'Feature B' file3 file 4`