[ummjackson]

This still doesn't explain how large scale search indexing could take place effectively... the data still needs to float upstream un-encrypted, processed and indexed.

Somehow offloading full-text indexing to the client, uploading encrypted indexes to the server and then elegantly combining those indexes across users to display a unified search would be arduous and I don't see anyone doing it.

Also, IndexedDB has been around for years and still suffers from a variety of cross-browser inconsistencies that make it a little painful to work with.