I was thinking elixir/erlang too. I've only been using it for a couple of months but I've quickly come to the conclusion that their claims of robustness are not in line with what I want/need. For example, the pubsub lacks persistence and if the node that carries that info dies, you lose that data. There is no built in consensus that tries to maintain state in the face of failure, so you bring in Oban. I've yet to experience the advantages of elixir. Sure, I can hot reload a module, but I spend probably an hour a day waiting for things to compile. I prefer k8s and Go but figure that may be because I'm still new to the ecosystem.

so far we've had little need for persistence in pubsub, for the few places we do, we have used oban the same way you have. It would be easy to pull in a library like Yggdrasil and abstract it away. For the most part, we just haven't needed it enough to justify setting up rabbitmq or kafka. k8 is indeed useful but the benefit of elixir here is that I can setup the supervision tree in pure elixir. By keeping things simple, we've been able to focus on pushing out features instead of worrying about infrastructure.