Looked at this feature, almost everything in it was in other settings before, except perhaps 2G networks and automatic reboot after 3 days without unlocking. Antispam, antitheft, call and message filter, antifishing/malware detection firewall, disabling installation of applications from unknown sources - all this is now enabled with one slider. But I need to install third-party applications, I think many people choose Android precisely because of this. And I can't turn on the new additional protection feature because the choice is all or nothing.
Yes, you are right, everyone need to switch to Graphene OS, I still can't decide to get rid of Google services and some Google play-only apps.