> Wait, this seems to ignore the fact that with good change controls and sound code, products do not just fail at 3am.

Because network outages never happen, disks never fail or fill up, memory is never an issue, programs always deal with only the data they were expected to, products never do more traffic than expected, and all infrastructure software ships completely bug-free.

If you aren't occasionally up at 3 AM fixing unexpected outages, then either you haven't deployed a project that requires uptime or you're paying someone else to do it for you.