I came home and started reading up on it (yes, on a Saturday night).
Script writer Robert Orci on why Arcee, a "female" Autobot did not appear in the film:
I would have liked to see Arcee, but the idea of a female Transformer needs its own explanation, and there just wasn't going to be enough time. It would have been like, "Oh, that's convenient. They're trying to appease women with a pink Transformer."Okay, is he saying:
1) All transformers are supposed to be the same (and, of course, male) so Arcee didn't fit?
2) Since women's primary purpose is sex object-ness and the (default male) transformers don't seem to have sexual urges, so Arcee didn't fit?
3) Since this was a movie about male figures engaging in the age-old battle to decide the fate of the world, Arcee didn't fit? (You know, let teh menfolk hash out the important stuff, then bring in the women?)
All theories aside, I really don't understand what he meant.