[QUESTION] Why `read_from_replicas` is still reading from the primary ?

[raphaelauv]

When set to true, read commands will be assigned between the primary and its replications in a Round-Robin manner

If I have 4 replicas for 1 primary node, I would expect read_from_replicas to only read from replicas and only read from primary if every replica do not answer.

So why still reading from the primary in a round-robin way ?

Thanks.