We also did not get a conversation where Emma explained the adoption thing. Maybe it means the writers felt there would not be enough interesting drama in any of those scenes, compared to you know, people fireballing each other over magic daggers and old feuds.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass