Yes, I agree and this what I was trying to say but apparently didn’t succeed…lol.
I understand the frustration experienced by someone who has learned shadows and highlights adjustments on another software and expects DXOPL3 to behave similarly. I also understand that the procedure that I use will be considered to be too much work or too complicated by some. I forgot to mention that I sometimes have to adjust the sliders multiple times before I am happy. I also forgot to mention that I sometimes have to use local adjustments to push shadows or highlights that are too far out of bounds for the global sliders. As @OXiDant mentions I also use the advanced contrast sliders in FP5 to enhance the SA adjustments. I understand someone feeling that this is waaaaaay too much trouble.
I am no longer a professional photographer(but I’ve been there) and do not have to process large batches of photos under a deadline any more. I am now just an hobbyist so I don’t mind the trouble, in fact I enjoy it. So, I’m happy with the sliders the way they are and as Peter pointed out, sometimes the overlapping of the sliders provides subtle gradations that wouldn’t be addressed if the sliders had a very narrow band of effectiveness.
I am not opposed to eliminating some of the overlap of the sliders but I hope that some is left in place. Perhaps the solution could involve a switch between a “narrow band” selective adjustment tab and a “legacy” version where the user could decide which to use based on the photo that is being edited at the moment.