Unmanged Cluster - what is the point of mongos?

MongoDB Percona Operator for MongoDB
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Using PSMDB Operator v1.13.0, configuring cross-k8s-clusters replication.
Main cluster comes online and ready. Replica cluster hangs in initializing status.
Noticed that mongos pods would not come up, logs are saying Authentication failed","attr":{"mechanism":"SCRAM-SHA-256"... which should be expected, as according to this the operator for unmanaged cluster will not create secrets, certs, users, etc.

Does mongos in unmanaged cluster make any sense?

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Yeah, it does in case of sharded clusters and failovers. You need to inherit certs from your “main” cluster and magic would happen once you add RS nodes.

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I am running with allowUnsafeConfigurations: true, which, I thought, makes SSL not needed.

I “hate” the magic :), I mean I love it, but since it’s me trying to tap into this magic - I need to understand it

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