Surprised to see it's not idempotent. What if, for whatever reason, the caller fails to receive the response? Some information on changes is then permanently lo

Surprised to see it's not idempotent. What if, for whatever reason, the caller fails to receive the response? Some information on changes is then permanently lost. Would have expected to see something like /delta?since=<timestamp_here> but perhaps that's harder to implement & requires much more data to be logged.