Vault-standby service

Hello, I have a question regarding vault services deployed with helm chart in HA mode with raft.

As I understand the vault-internal is a headless service and is used for raft traffic. Next, the ingress object points to vault-active service which then points to the pod that was elected as a leader. The thing that I don’t understand is what is the role of vault service and vault-standby service. The vault service points to all pods, while the vault-standby service points to standby pods. As far as I know, the follower pods forward requests to the leader pod unless you have an enterprise license where you can configure them to handle read requests.

So my question is basically why these two services are deployed and what is their role if the performance standby node capabilities are not used?