Of course... that said, there are too many times where the additional complexity isn't necessary or worth it. I say this as someone who is usually somewhat ear

Of course... that said, there are too many times where the additional complexity isn't necessary or worth it. I say this as someone who is usually somewhat early to introduce RabbitMQ or Redis into a new environment. Most applications, in most environments are not ever going to see more than 10k simultaneous users. You can vertically scale an RDBMS like PostgreSQL a LOT. Not to mention, there are also a lot of ways to approach similar techniques with PostgreSQL that you might reach for a different DB platform for. JSONB in Postgres is actually easier to reason with IMO than MongoDB as a platform. Depending on your needs, it's a much better fit with hybrid tables with additional details in JSONB.