On v4.4, the default RSM protocol is 'sdam' rather than 'streamable'. retryable_writes_error_labels.js forces commands to fail with a number of different failures - on master, we use a failpoint to speed up exhaust isMaster replies to make sure we exhaust the retries for each command before hitting maxTimeMs. We don't need this on v4.4 since this test will not be running with the streamable RSM enabled.