There are for example products like keycloak. OpenID/OAuth2/Token/Security IdP in a box.
Why there is not ticket system in a box? Yeah, we all know Jira and friends, but these are products not building blocks.
Another angle is: Why the hack does everyone rewrite their microservice foundation. Inbox/Outbox/Worker Queue/Throtteling/tracing/..... What happened to the application servers of the past?
I am a big supporter of that narrative. Why do I need to write more than my dedicated business logic and wire up some UI (and do not get me started on UI space).
IMHO, this can be a real differentiator for the language platforms. Ruby has parts of it, but is still far of.