Hey!! Good points all, and I pretty much agree. I don't have any issue at all with Hermione being interpreted as black or played by a black actress or with JKR supporting that (though I wish she'd done it differently). And I've definitely heard the same thing, that real-life structures don't apply in the Potterverse, but I don't think that can be entirely the case for Muggle-born children in practice (inasmuch as you can have practice in a fictional universe) and there's something I find worrisome about extending the suspension of disbelief that far when young readers can take away the idea that race doesn't matter, instead of that race shouldn't matter. So I suppose I agree that that's how it's meant to be, but don't think that's an ideal take. Still really happy with the casting decision and JKR's support for it, just wish it had been done differently!
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