LocalSession Enabling in Zookeeper

[Meet0861]

Pulsar version: 3.0.6
Context: we have global zk in 2 regions, R1->2 participants, 2 observers and R2->3 participants, 2 observers. Leader zk is in R2.
Now, lets say in some situation, the quorum is down and the R2 zks went to Read only mode.
Config: we have enabled the metadataStoreAllowReadOnlyOperations in the broker and got to know that localSessionEnabled should also be true as validation is added in this commit:apache/zookeeper@c47ef90 that global sessions dont work in RO mode.
Query: whats the impact of enabling the localSessions in Zookeeper from pulsar side? We read the documentation that local sessions to global session upgrades automatically once quorum is up. But is there any other impact of enabling this in normal situations?
Moreover, Even after enabling this, we have observed that broker makes RO connection with ZK, but still fetching metadata doesn't works and even lookups also dont work. is there any limitation on what sort of reads will work in RO mode?