While you're correct that the overall seller DSR number is no longer evaluated as it stands, unless I've missed a major change to the defect system, there are two DSRs that are included in seller evaluation. As I'm sure you know, these are "Item as Described" and "Shipping Time".
If a seller receives a 1,2, or 3 for Item as Described, or a 1-star rating for shipping time, a defect will result. So DSRs are still tied to the defect system in this sense, and are something sellers need to be concerned about.
Yes, I'm quite aware of that which is why I explained that to the OP in post 14.