Just to add to sibling comments, one killer feature for me is ChangeStreams[1]. It's miles ahead of what Postgres[2] offers, and it enables really interesting use cases. Some of my services built around ChangeStreams end up not doing a single query to the DB. Data is right there in the program memory, indexed how I need it to be, and program is immediately reactive to any changes in the DB.

[1] https://www.mongodb.com/docs/manual/changeStreams/

[2] https://blog.sequin.io/all-the-ways-to-capture-changes-in-po...