In a way I'm disappointed that it wasn't what I thought, because the idea of Loki projecting his mother in order to have conversations with her coloured the way I viewed his character, and I thought it was an interesting concept.

BUT what you describe sounds interesting in a very different way, and I do wish it had been included given the importance of mother-son relationships in the film. Plus Thor's Avengers line of "he's adopted", while funny in that moment, didn't ring very true for the character as a whole.