No, it's not. I can easily configure open ports using firewall-cmd. That is basic security. And there's no dedicated options to configure outgoing calls, there's no sane defaults to start with (I have no idea which targets should be whitelisted: ntp? update servers? anything else?), there's no system-wide integration, like my dnf can choose different mirror every time it runs.
Of course it makes sense to configure outbound white list, but there's no infrastructure in RHEL or Ubuntu and nobody's going to bother with custom scripts for that.
Of course it makes sense to configure outbound white list, but there's no infrastructure in RHEL or Ubuntu and nobody's going to bother with custom scripts for that.