Full automation in e-commerce may lead to inflexibility. As stores scale, unexpected issues like payment discrepancies or mismatched shipping details arise, overwhelming the system. These exceptions require human judgment to manage effectively. Sustainable operations involve automating predictable, repeatable tasks while assigning human resources to oversee and resolve anomalies. For instance, while Shopify's order processing can be automated for standard workflows, situations like mismatched shipping addresses or payment disputes necessitate manual intervention to ensure customer satisfaction and operational resilience.