What’s missing: Google Photos for Documents

Option to categorize items with folders AND tags

Easy sharing and collaboration

Sync all files stored on different devices instantly

By creating a new UI on top of the old folder structure features are possible that weren’t before. I listed requirements for what I want from a next gen-filesystem (excerpt):

Where you see clutter, I see opportunity.

Google Photos launched in a saturated market but took the crown. You throw photos at it and it does the rest.