Okay, but like.. The dark path was never "justified." It was always Guy having a gross overreaction to a mostly reasonable ask: "Hey, can you please give me 0.0004 of your net worth, so a loan shark doesn't cut my hands off?" The idea that Nicki needed to be unsympathetic/distant, in order for the dark path to work, just doesn't hold water for me.
It's true that you'd have to have a very unfavorable reading of Nicki in order to think Guy's actions were justified, but it doesn't change the fact that some of the players had such reading of her and thus had much easier time justifying the dark path as actions their Guy would take in response to Nicki's approach. It may not hold water for you, but the evidence is right here, in the shape of people all across the thread voicing this kind of opinions. Both before the update, and after the changes.
Those players had the proverbial rug pulled from under them, with the narrative changes, and it changes how Guy looks when taking these actions,
to them.
Besides, where was this energy with Viola or Ashe?
This was also explained by other posters: once you buy into the idea that Guy gets a taste of demeaning people when he explodes over Nicki's "betrayal" and "gold digging", it's easier for him to seek the same emotion even when it's no longer "justified". Without this catalyst the whole dark personality of Guy is kind of out of nowhere, and for some players it's harder to take asshole options "just because" when they didn't witness/orchestrate their MC's corruption themselves.
Guy (especially at this point) is a giant ball of neuroses, and he doesn't always make great decisions.
I think it might actually be part of the problem. Players generally hate to be saddled with a loser MC and have dumb decisions forced on them for the sake of the plot, and this is now their first and thus potentially long-lasting (if not last) impression of Guy. "I don't want to play (or associate with) someone
this dumb" is a valid reaction.
The previous iteration was more of a blank slate, with prologue being relatively simpler and done in rougher strokes. This one in comparison doesn't leave much room for interpretation. Guy is what he is, a paranoid, easily conned idiot and also maybe a creep.