I run it on k8s for a medium sized company, as running via compose didn't seem to scale well for us. I even upgraded from 9.11 which ran a handful of containers to the most recent version which runs 15+ containers.

You get used to the quirks of running it and then it just works, but it did take some time polishing the health checks etc to get it HA and scalable.

None of the helm charts I tried actually worked or provided HA.