If engineers fear being on call it means the software isn't properly engineered and development processes have failed. Because if a service is properly engineer

If engineers fear being on call it means the software isn't properly engineered and development processes have failed. Because if a service is properly engineered to maintain availability, being on-call is a small burden because downtime is a rare occurrence. However it's often the case that "on-call" means ship broken software and fix bugs after hours.