[tucros]

Your first and third points have nothing to do with FBA or FBM so I won't comment on those. Commingling is a cluster fuck though for sure and you won't find really anyone who disagrees, and any seller worth a damn has turned it off and never used it. Commingling can have severe repercussions for sellers besides, like being suspended.

Regardless, if there is an issue with a commingled product, Amazon's customer service will take care of it instantly, which is putting the customer first. I imagine there are a hundred variations, besides commingling, where sellers do shady shit, and regardless, Amazon will take care of you as a customer quickly, without question, and usually with additional compensation above what is expected.