cephadm: Multiple daemons of the same service on single host
ceph orch apply rgw myorg us-east-1 --placement="2 myhost1 myhost1"
We use multiple replicas to make a service HA. Having them on the same host provides little benefit.
Exception is a ceph-nano style deployment where you need multiple MGRs to be able to upgrade them properly.
Adding this would be great, but low priority.