If the suggestion truly is to try squeeze as much utility as possible out of a single RDMBS setup, and if you already need and use an RDBMS, then I would consider it as an option. If not, it's an absolutely idiotic choice. And that's the problem with this article - it really comes of as a suggestion to supplant your Redis setup, a dedicated key-value store, with Postgres, a full-fledged and highly complex relational database.