I'm going to admit that I didn't read the whole article.

I remember about 10-15 years ago that there were a lot of photo organizers that supported tagging. Tag the events as birthday or the people's names. I saw a lot of people who would then post "My photo organizer has been discontinued and I spent years organizing by tags. How do I migrate all the tags to another photo editor."

The hierarchical file system is kind of a lowest common denominator. I can copy a directory structure from ext4 to brtfs to zfs to ntfs to exfat to macos or whatever and have the same organization.