I believe the majority of the intent behind this functionality request could be achieved with the combination of the above recommending pinning/new post + scheduled digests.
A lot of the interest here is for a newsletter case use. A newsletter topic combined with a pinned post for visiting/active users and a scheduled digest (for inactive/passive users), I think would meet a lot of the demand.
Currently though, I’m not sure if it’s possible to schedule a digest in this way: