Comment by WorldMaker

In my case, at least, PouchDB is still a lot handier of an offline-first mobile-capable DB than just about anything else, and because it speaks the CouchDB replication/sync API that still leaves a lot of use cases where CouchDB is more feasible. (It would be great to have more document DBs converge on a replication/sync API for offline-first applications. I've voted on the UserVoice suggestions to CosmosDB on the idea.)