I'm a big fan of Firebase and have seen a lot of projects get up and running very quickly and scale as well.
However, I think there are an increasing amount of reasons why you want to have your data stored in a SQL database that you can access. The open source tooling being built around SQL (usually Postgres) as a standard is becoming better and better and it's going to be hard for Firebase to compete with all those offerings. If I run a Postgres database I can instantly have tools like Hasura [0], Metabase [1] along with others that add a ton of value out of the box. However, maybe those tools will also integrate with Firebase.
Anyway, my point is that this is best of both worlds, so great to see!
However, I think there are an increasing amount of reasons why you want to have your data stored in a SQL database that you can access. The open source tooling being built around SQL (usually Postgres) as a standard is becoming better and better and it's going to be hard for Firebase to compete with all those offerings. If I run a Postgres database I can instantly have tools like Hasura [0], Metabase [1] along with others that add a ton of value out of the box. However, maybe those tools will also integrate with Firebase.
Anyway, my point is that this is best of both worlds, so great to see!
[0] https://github.com/hasura/graphql-engine [1] https://www.metabase.com/