The essential difference is that this is a stream, not discrete messages. Yes, I know that at the IP or UDP level a stream consists of discrete datagrams, but t

The essential difference is that this is a stream, not discrete messages. Yes, I know that at the IP or UDP level a stream consists of discrete datagrams, but this is not how users think of streaming media. It's like a developer arguing that a project was completed exactly to spec, when the spec isn't what the client wanted, and the dev didn't make any real effort to understand what the client wanted. You could always trade latency for security by batching more of the stream and encrypting larger blocks.