You missed the point entirely. The goal is not to need on call, because you BOTH have a stable system that requires rare off hours interventions, AND you have

You missed the point entirely. The goal is not to need on call, because you BOTH have a stable system that requires rare off hours interventions, AND you have a team that owns that and is bothered rarely enough to not need to have a formal rotation. On call systems with stable systems in my experience tend to be a real problem because people lose the on call urgency anyway. TL;DR - the problem is your system, not being on call or not.