ostgres is no longer "just a database." It has become a data integration and distribution platform. It has hooks for integrating custom data types, data formats, remote data store integration, remote index support, a rich extension ecosystem, cascading logical replication facilities. It is practically an application server. A proverbial swiss army knife to say the least.
At the day job, we use postgres as the primary database. Being a communication platform (chat) we do a good deal of real-time whiz-bangery. Being that we are an early stage start-up, we try to follow the keep it simple, stupid (k.i.s.s.) approach. Do the simplest thing possible until it isn't simple anymore. The simple approach to real time was