One of the challenges with ADL is that it can be a bit unpredictable, like most automated functions. Sometimes it will do things that are good and usefully boost shadow detail and sometimes it does the opposite for no apparent reason. For example, I just took a photo of some snow and trees in my backyard with an ADL setting of low. It was overcast and the light levels were low. As you might guess, the image was a bit underexposed since the matrix metering tried turning the white snow into grey snow. I brought the image into NX2 and then turned on and off ADL. Surprisingly, ADL took the underexposed image and made it even more underexposed. Huh?
Given the above example, the challenge for NX2 users is that even on low settings, there can sometimes be a problem. It may reduce the brightness of the raw conversion settings (unbeknownst to you since they're hidden), which then requires you to either recognize that by toggling it on and off (unlikely for many photographers) or to increase brightness in other ways, some of which result in a degradation of quality. Edit steps are a good example of the latter since you're creating an underexposed image raw and then pumping up the brightness level via a non-raw change. Personally, I lean toward predictability and having control over what's happening.
The TTL-BL analogy with flash is a good one. Sometimes it works fine and it's great, and then sometimes it goes haywire. You're usually better off putting a bit of thought into it and controlling what it's doing.