We're eventually going to support a lightweight Postgres-backed messaging table, but the number of pub/sub messages sent through RabbitMQ is typically an order of magnitude higher than the number of tasks sent.
(1) you, for free
(2) develop all the functionality of RabbitMQ as a Postgres extension with the most permissive license
(3) in order to have it on RDS
(4) and never hear from you again?
This is a colorful exaggeration. But it’s true. It is playing out with the pgvecto-rs people too.
People don’t want Postgres because it is good. They want it because it is offered by RDS, which makes it good.