But look at the path components: they're not organizing things just by date. The files are first organized by purpose (long-term storage), then by origin, and o

But look at the path components: they're not organizing things just by date. The files are first organized by purpose (long-term storage), then by origin, and only then by date. So they've already made the decision to commit the files to long-term storage, and to keep the original photos separate from subsequent edits, and to keep them separate from other image sources (e.g. downloads). That "tagging" required very little effort because they could just navigate to the existing tag in the filesystem, and put the new files there.