Yes. Usually when I build an application I'd use a single database. While I don't think in the end it would matter for PostgreSQL or CouchDB, two databases is a bit much. Just curious as why they use two databases that can accomplish the same task (from what I can tell from my limited digging into the project).
People not using a relational DB drives me nuts when it clearly is the right tool for the job. Possibly that is his issue. Something that is a perfect match for a relational DB and instead use a "NON-SQL" DB for a project.
[1] https://github.com/prasmussen/glot
Pet Peeve: There is no way to post ASCII diagrams on HN