Almost all Daz skins (those on the upper basket) use head/body scans to some extent. It's generally deep burried into the skin, so most won't even notice. Iirc iSourceTextures tend to push it "front & center". It's not bad per se, as Daz use high translucency which permit that kind of behavior (it ain't gonna work well with a real PBR skin shader), but could be better balanced with 2 much more distinct diffuse maps (Base Color/Translucency) imho.
As for red noise and other SSS failures, it's sadly very common in way too many skins. Some even are sold with fully broken one (SSS no fonctionning at all despite what you could read in the shader). I think it's due to how work transmitted color and confuse the shit out of people. That being said almost no Daz skins are really broken beyond repair.
Fun fact about bluejaunte, it's the exact same base skin, twisted and twisted again over the years (it's not as bad as it sounds). I think Ensley is its best one, especially how he uses the top coat (and you can't do the trick with PBRSkin, great sadness).
For HDRI, I use most of time simple generally IBL for fast rendering (
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,
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and so on) with few spotlights twist. IIrc PaperTiger ones are fine.
Since it's asset recommendation, if you don't have it, one of the best plugin ever made,
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! You will thank me when your crappy scene has dozen billion of light o/