Perhaps I am naïve in trusting the shows writers and researchers. I was upset by the episode, but to me that's a mark of good writing, because if I didn't care so much about Anna, or the scene wasn't depicted in the way it was, maybe I would have been shocked, but not upset.
I agree with the posters who have said the aftermath will be more triggering because for me its worse than the act itself.
I don't think the characters of Anna and Bates were changed, she was being friendly to the guest servants, and he absolutely knows that something is wrong, but he's not pushing her, he knows his wife and he knows that she has her reasons.
I fear that Anna will be pregnant, though I would prefer if she wasn't. Its the way that they handle the aftermath that I will judge, rather than the act itself.
I can see why people might see DA as light sunday viewing, but really, its not at all. I think that it would have died after series 2 if it had stayed light and fluffy, and everyone would be calling it unrealistic for not highlighting how difficult life was then.
Even now, I think it glosses over how grinding life was for the servants, there is very little mention of how long the days are, how little the pay is. Life as a servant in DA looks cushy tbh. I wouldn't want it to turn into The Village, but still.