Also with LR depending on you style for your finished images there are often times when using values that would be considered too extreme in one circumstance will be perfectly normal in another. I often shoot in situations where I need to maintain highlight detail while maximising the details in the shadows, so I will expose to the right, will have the highlights at -100, the shadows at +100 (maximum positive and negative values) and the exposure between -0.5 and -1 EV. If I don't ETTR though I wouldn't want to push the shadows slider past about 20 maximum with my 50D, and my older 20D you probably wouldn't want to push shadows at all in the same situation, yet the +-100 still works fine if you ETTR, although you can't push it as far with the exposure slider. It all depends on you total technique, from exposure to final processed image. When I shoot ETTR for processing in LR with high dynamic range the SOOC camera JPEG conversion can look somewhat like an over exposed mess. Yet once they are processed in LR they look great. Fortunately I'm not worried by what the in camera preview looks like, just the finished processed image, and correct exposure is based on having the best starting point for a good conversion. The same can be said for sharpening, as well as the amount and radius sliders in the LR sharpening panel, there is also a masking slider. This allows you to apply an auto generated mask to make the sharpening selectively applied to strong edges only. it is possible to apply either low amount sharpening, without the masking, or to use high amount sharpening with the mask near maximum. In one situation you would maybe max out the amount slider at around 30 to 35 while with the other you might start with an amount setting of 70. neither of these approaches is wrong, but the type of image will make a difference. I used to have to take most of my aviation images into PS to apply selective sharpening with a layer mask, either high amount USM, or high pass sharpening, and would have to manually create the layer mask using a copy of the image and the find edges filter, LR does this automatically now.
So as you can see two examples of where you could use totally different sets of slider values, that work perfectly well, but could have some people say that you should never use the sliders in those value ranges. Of course since LR does everything nondestructively, just like all RAW converters, it is a simple matter to play with the sliders and experiment to see what effects you get.