Allow more useful Before/After comparisons; e.g. history states like Lightroom

DxO makes a great product but there is room for UI improvement. Before and after comparisons are very helpful, but comparing DxO results back to the original raw file is not very helpful as raw files will always look worse. I’d call it an artificial comparison. We need useful options, like comparing the Default DxO settings to the changes we implement—just like we can do in Lightroom. I understand this has been on the wishlist for a long time, why hasn’t it been implemented??