> if it happens so often that there needs to be an official rotation to deal with it Frequency doesn't matter. Even if issues are rare, for many companies it's

> if it happens so often that there needs to be an official rotation to deal with it Frequency doesn't matter. Even if issues are rare, for many companies it's terribly important that the issues that do arise get fixed promptly no matter what time they occur. Your company should very definitely care about the frequency of off-hours support issues (your previous employer apparently did not) and work to reduce them if they're anything but extremely rare, but somebody should still be on-call.