[jrumbut]

Yeah a number of pieces of software people use after a 5 minute tutorial are like this, a ton of depth that we frequently recreate crappy versions of within our apps.

The Apache webserver (and most other webservers) is another example like Postgres where it has a ton of useful features no one uses.

Some of these less popular features don't work at massive scale but in my experience they work great for smaller teams where adding a new tech to the stack is more painful.