I just finished the series last night. Weirdly the thing that bothers me the most (although not the only thing that bothers me) is the Kinkle family owning the mine. In fact, everything relating to the mine bothered me. First, if they owned a mine, they would be relatively wealthy and they wouldn't actually work the mine. I mean, I admit that most of my knowledge of mining is from watching the first few seasons of Justified but ... seriously. Second, I understand the retro aesthetic of the show but the 1940s coal-mining equipment is pushing it a bit too far. Third, if there is a mine collapse the owner can't just declare everyone dead after like 24 hours and hold a funeral. The general absence of police or any authority/regulatory officials in the whole show is jarring but COME ON. I can suspend my disbelief on the School for Unseen Arts more readily than for that.
I agree that Sabrina is a weak link in the show. I appreciate her being confident and pushing forward despite odds but resurrecting the dead is beyond the pale in any understanding of the world. The fact that she did it, that she thought she could outwit the balance of nature by offering a soul and then taking it back, is a level of confidence too far. She really thinks the rules don't apply to her and I don't know that the fallout was enough for her to get it. The very next episode, within thirty seconds of Hilda saying "I can't hold this much longer", she abandoned her!! Like, WTH??