Isn't the builtin openssl lib a basic shim for LibreSSL, mostly only there for backwards compatibility and with limited functionality. IIRC Apple want you to use their Network framework https://developer.apple.com/documentation/network.
Adoption is the default for a few BSDs, OpenSSH on Windows, macOS.
From a usage standpoint, you're probably correct (I honestly don't know) -- I only use it to generate web server certificates.