Changing DTC product pages means checking every app that reads them

We updated a DTC product page layout to improve variant selection and mobile speed. The theme change looked good in preview, and add-to-cart worked. After launch, support noticed reviews missing from a few products and a size guide showing the wrong chart. The issue was not the main template. It was the apps that depended on old product metafields and section IDs. We fixed it by making a…