Suppose I want to order a Logitech C930c webcam, there are currently 18 different offers on Amazon for that. The reviews on the product page should be reviews of the webcam, not of any individual seller experience (should be in the sense of "Amazon wants it this way" and "because that's what makes sense for Amazon shoppers"). If I'm on that product page reading reviews, I'm researching that webcam, not the seller who happened to sell it to you.

You're more than welcome to review the seller shipping experience (which shows up on the seller detail page that probably gets little traffic), but anything you post about a seller-specific incident on the general product review set isn't helping anyone.