yea I guess I miss-understood the feature - I suppose it's good if you are under active attack by spammers who just registered.
Makes more work for moderators and new real users who wish to contribute actively, forcing you to manually approve every post for X days.
It doesn't help when a spammer creates a sleeper account and then start spamming after the waiting period.
It feels to me it overrides and or conflicts with existing promotion rules & group permissions.
Perhaps in the future a tighter integration or features to explore to balance between preventing spam and reducing moderator workload.
One thing would be a quicker more obvious method to see who is under restriction and remove moderation restriction.
Such as: Approve This Post | Approve this and Future Posts