We have a need to retire courses, meaning we don't want to have anyone new enrolled in them, but ideally anyone that is already enrolled can complete what they started or re-access it to re-watch in the future for reference. We can't mark it inactive, otherwise access for those already enrolled is removed.
This is important to us as a software company, since we come out with new versions of software and want users to be enrolled in those new courses, but other users may still be on prior versions and want to access/rewatch/reference the prior version courses.
I believe you can turn off self enrollment rules so it removes it from the catalog, but the users still enrolled in the course can access it.