I think it's a fear of _sending_ emails. You could accidentally trigger a cronjob that sends a bunch of emails and gets you put on spam filters. Error reporting

I think it's a fear of _sending_ emails. You could accidentally trigger a cronjob that sends a bunch of emails and gets you put on spam filters. Error reporting for cron is, of course, important; but the builtin email reporting is best used for the local machine/network. A more flexible and robust solution calls out to an API that handles transactional emails/push notifications with debouncing, escalation policies, etc.