I have no problem with addiction like THAT, then they just have to retcon the lore properly and explain it properly. It's not about power then it's about getting high. If a blood mage would feel really good every time they used blood magic, then it would make sense, and I wouldn't have a problem with that. Kinda like Ardat-Yakshi.
No, addiction doesn't mean high. Addiction in this case would mean that every time they use blood magic they want more power from it and they become less concerned about who they use to get that power from just as long as they are able to get more, to the point that they start using their friends and allies and don't care what the cost is.
The developers only said race and class would be acknowledged, so it's unknown if there's enough time for the specializations to be addressed as well. It may be an issue of being unable to properly acknowledge it in the narrative, given the negative perception Andrastians have about this school of magic.
Granted, but I don't see them taking it completely out of the game rather then scripting the necessary reactions to using blood magic that would be needed. It wouldn't take that much to allow for Follower A is anti blood magic, if you are a blood mage you have a rocky relationship with them and they eventually leave. The Chantry is extremely anti BM if you openly use BM then they will be nearly impossible to cooperate with. It wouldn't be any more difficult then scripting reactions to you being a Qunari or Dalish with some of the interactions.
The problem is that they can't figure out a way to bring the consequences they want for blood magic into the game in a sensible way. Its either not enough of a cost to get across the problem of blood magic or it is too harsh and gimps the character.
But that's not the point... Evil is subjective, but hey let's just for the sake of an argument say it's evil. So what now? Blood magic is evil and it's not available to the pc why?
This is why I don't think it has anything to do with being evil perse`, they don't have an issue with us being a souless murdering serial killer if we wish to be, it isn't about it being good or evil, it is about them not having a way to truly show the consequences of using blood magic.
There's nothing in the lore that even suggests that would be the case, so I find that incredibly at odds with what we actually know. I also recall Gaider saying at one point that it pertained to the user, and that while it could be corrupting, it wasn't necessarily so.
It was said plenty in the promotion stuff and the bsn boards prior to the launch of DAO. DA2 didn't mesh with that and I don't know if they painted themselves into a corner by having Merril be a blood mage and didn't want to say she was automatically evil, but the early launch and promotion lore from DAO and the comments they made with DA2 do not mesh up well at all regarding BM.