I support FoundationDB's approach to databases which is basically provide a consistent, distributed, and ordered Key-Value store then you can build whatever ty

I support FoundationDB's approach to databases which is basically provide a consistent, distributed, and ordered Key-Value store then you can build whatever type of database you need on top of it whether that's RDBMS, Document, Graph, etc. With that said, CouchDB 4.0 (on FDB) is going to be killer. Master-Master replication between clients and server with PouchDB is phenomenal when you remove the complicated eventual consistency on the server side. And as a plug, I'm building a multi-tenant/multi-application database on top of it.