If you are operating under jurisdiction where courts can either sue you for encryption usage or force you to somehow reveal you encryption keys (however new session encryption keys are generated each session). Those courts can not demand for authentication and signing keys in most cases.
Do not let mode’s name to confuse you: it still provides confidentiality and authenticity of transmitted data! But pay attention that this mode is traffic and resource hungry and currently operate only in TCP mode.
If anything that can not be read by anyone is considered encryption, then encryptionless mode won’t help you. Imagine that either you are talking on another foreign language, or just use another date encoding scheme.