I just think it's too safe and boring. I want the audience to be either surprised, intrigued, or thrown for a whirl. There admittedly IS a bit of a rift between an actor feeling obvious and a super popular choice for the character that everyone and their mother clamors for.
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The thing is , if we're talking about a
general audience, I don't think you'd get that many people who would automatically assume they'd know what they'd get from Chastain as Ivy.
It's basically us in fandom who would come with assumptions about her performance ,since she's a name who's been suggested by those in fandom.
I actually don't think if she were cast that general audiences would come in with a crystalized notion of how she would play Poison Ivy.
GA tend to give actors and actresses alot more leeway than fandom does , and an actress like Chastain isn't a pop culture icon the way Nicholson was when he was cast as Joker , Devito was when he was cast as Penguin, or a pop culture Figure like Ben Affleck or even Robert Pattinson when cast as Batman.
Chastain doesn't come with that type of preconception, so audiences would come to her Ivy with a clean slate.
If Chastain's performance is good, and her character is written well , it's just as likely she could surprise and intrigue audiences just as well as an " outside the box " choice.
Frankly , I wouldn't assume that alot people outside of fandom would think Chastain is an obvious choice for Poison Ivy to begin with.
She seems like an obvious choice to
our circles, because she's been brought up alot , but I think if she was cast , the entertainment reporters ,outside of fandom, would point to the variety of roles she's played from The Help, Zero Dark Thirty, the Eyes of Tammy Faye etc., including an Oscar win.
At the end of the day we're all gonna have our own preferences , so I can understand not being into one actor in relation to another.