I've been wondering this too: for us, UUIDs are super opaque. But for an agent, two UUIDs are distinct as day and night. Is the best filesystem just blob storage S3 style with good indexes, and a bit of context on where everything lives?

One thing directories solve: they're great grouping mechanisms. "All the Q3 stuff lives in this directory"

I bet we move towards a world where files are just UUIDs, then directory structures get created on demand, like tags.