While I wouldn't call macOS "shit" you're not wrong. On a Slackware 14.2 box and an OpenBSD 6.2 box I just tried both man openssl and openssl --help work fine.

While I wouldn't call macOS "shit" you're not wrong. On a Slackware 14.2 box and an OpenBSD 6.2 box I just tried both man openssl and openssl --help work fine. edit: Actually --help does start by saying --help is an invalid command but that's easy to miss because you then get a standard usage command with a basic summary to get you started.