Sigh, that argument again. The story is that several versions of the armor are developed during the film.
Yeah, I get that. But it still feels like a cheap, unnecessary gimmick.
Much like in the Knight Rider remake when they had KITT changing colors and transforming into a truck for no good reason.
The original movie got across the idea that Robo was a product with no rights perfectly well. We didn't need to see him in a series of different colored armors to make that clear.