I rewatched the finale, which has been helpful with this show when it comes to understanding, thoug that's not exactly a rigining endoresement of it's narrative structure. Still....
I find that I understand it a little better. What seem like quick character turns really are not, if you look at it from a certain point of view (an important concept for Star Wars). It had seemed like Osha kind of abruptly changed, as did Mae, but if you do take them as the same person, then it makes more sense. She says she is not her sister, but basically if Mae would do it, then Osha would do it. Mae seemed like "the bad one" but in reality, all of those things - from torturing small animals to killing for The Stranger - Osha would do those things too. She seems to be annoyed by Mae, but don't we all have aspects of ourselves that we don't love? I think that really works if you just picture every scene as Mae OR Osha - it could be either and work. I wish they had explored that a little more, but wrapping my head around it helps the narrative.
What I still don't like though, and this is more of a commentary than a critique, but treating it as if Osha has done the right thing here. It is not and never will be the right thing. Sure, it's what she wants, but what she wants is selfish and evil. That is not to be celebrated. Some have called her journey "triumphant" (I'm looking at you Leslie), but it is nothing but a failure. It's a failure to do better. I am not sure it is a "fall to the Dark Side" so to speak, as it seems that Osha has always been dark. I believe she was born of the Dark Side, that the coven practiced the Dark Side - even if they didn't call it that - and she has always lived with that hate and rage. You see her trying to overcome that though, but in the end she couldn't. Maybe it wasn't possible at all. The vilification of Sol makes that even more of a bitter pill to swallow. I am not on Osha's side here.
So, that's my final take on it. As a whole it wasn't bad or anything, but it left too many things up int he air. Unless that actually get a second season, I feel the story is woefully incomplete. I mean, it's always one thing to leave a few open doors, but this is more like not finishing an entire wall. I would like a second season too, but I'd like to see some changes made.