As much as I like that idea, I think it's clear the 'powers that be' weren't interested in an evil or even antagonistic Hydaelyn. I've said before, I thought she'd be presented similarly to Emet. Sympathetic motivations, but ultimately someone we had to stop. I still believe that it was Ishikawa's intention to present her as actually morally grey, especially as by action and deed she is unquestionably an antagonist to the extent of being compared to Emet (and Hermes), but likely had to rewrite it (hence the copious gaslighting) to appease others. Interviews from ShB would also hint at this being the case with Yoshi-P saying that we hadn't heard Hydaelyn's side of the story yet.
Venat remaining a 'good guy' would've meant either her memories were also erased or (as I've also mentioned before) going the Greek tragedy route where by attempting to avert the future, or 'prophecy', the WoL describes she ends up inadvertently causing it. It's one of the few ways I've thought of where she'd remain a likeable and tragic character. As it is, during her infamous cutscene, when she says, "All is excruciating pain. I breathe fire and torment." All I can think is, "Good, it's the least you deserve."
I think Venat having an opposing ideology, which was essentially the case, would've worked out fine. It's unfortunate that my character still canonically speaks of her in "fond" or "friendly" terms, depending on language translation, even if I choose that she wasn't justified or I believed someone other than her was. I suppose I begrudgingly have to accept it the same way Emet haters were forced to watch their characters reach out for him in anguish after Ktisis. It would just be nice if the MSQ itself (and the codex) acknowledged it and it wasn't tucked away in a side quest locked behind 'old' content.
At this point, I'm most concerned about the short stories. I've been giving Hydaelyn's summoners the benefit of the doubt that they didn't know the truth of the future or Venat's intentions. I think having 12 other people on board with genocide with no guarantee of success is just going to further tarnish their image as essentially a civilization of people on the edge all too willing to wipe each other out for conflicting mindsets, which aside from the two extremists we're introduced to doesn't appear to be the case at all. In fact, even the Watcher's dialog in the Omega quest chain would suggest Venat was so resolved in her convictions he couldn't change her mind if he wanted.
Most of us here were already unhappy with the messaging surrounding the Ancients in EW without the writers making it even worse. Having spoken with several in this thread (join the discord if you haven't :P), many of us have one foot out the door depending on how they're handled going forward.