I think you misinterpreted my post, You are of course completely wrong in that I'm throwing stones at an acceptable practice. What i was saying was, if things are busy, plotting a gps position using lat long versus quick referencing using the chart compass rose. I never said anything about NOT using DR as a backup. That means you can have an accurate position easily whilst maintaining the position like the one in your photo above
I am familiar with DR and use it plus I have had total electrical failure that you describe. I had a backup and I used it!