Amazon seller here - cominging is typically a long tail problem these days, as manufacturers with brand registry basically get their own special inventory/storage treatment. I know it doesn't seem like it from a consumer side, but we as 1P vendors have to jump through a buncha hoops to sell our own products using Brand Registry, and even more hoops in 3P items and extra labeling of barcoded items just to note that the items came from and are trackable to us.

*1P = first-party manufacturer, 3P = third-party (not original manufacturer) seller