Honestly, I'm glad that they kept as much as possible grounded, and that Vanessa is a human in the movie. It simplifies their story, and focuses on their feelings. I would've done it the same way. I've always loved their interaction and love story, but could've done without her powers and mutant story. Especially in a movie. Sorry for whoever loves her as Copycat. But, I mean, there's a shapeshifter in the flicks anyway. And who knows, maybe she'll become Copycat someday.