Feedwatch
Shopify app · live on the App Store · Free plan, $19/month to fix
Google Shopping and Meta will not list a product with no image or no brand, and Google may show one less when it has no barcode or category. It happens on their side, so nothing in the Shopify admin says so. Feedwatch checks every active product, names the ones missing something, prices them at the merchant's own list prices and fixes them from the same screen.