I agree here with most of @nicholas points. I have worked on space constrained boards with dense fine pitched BGAs and the PCB back side will “starts looking like randomly placed pads all over the place” due to the 0402 caps and differential pair escape routing. The board assembly house uses the Fab layers for checking placement against the X-Y data.
However, @nicholas, I am able to print front and back assembly fab drawings with the back side mirrored just like when you look at the board from the back. It usually contains the Edge Cuts, Back Silkscreen, Back Fab and a reversed Title Back Fab comments. I use Plot with PDF output selected and “Mirrored Plot” checked