There seems to be some confusion here. I don’t replace cronjobs with mix scripts. What I tend to do, when it’s possible, is run periodical jobs straight from the system itself. I.e. I spawn a process which will periodically execute a job. This is not always possible (or simple), but when it is (and IME it often is), then you can consolidate more of the implementation of the system into a single place.

None of my systems uses any version of cron. Me and my co workers have migrated to systemds timer units.

I just used crontab as the example already mentioned. There are surely other ways to schedule stuff even in the beam itself. The point was rather that it’s a tradeoff to be made if you reimplement something in elixir (if it doesn’t exist) or if it’s simpler to use OS level tools already existing. It makes sense to move stuff into elixir if the overhead of managing the external system is extensive enough. If not just use the OS level tool until it no longer fits the above premise.