I think that if they are blue to the point of being distracting or washing out the color of other elements, it becomes a problem. However, if it is just a slight tint, I have no problem with it.

For the record, they wouldn't have to be "painted" blue, could just be they changed to a different metal type that had a blue tint or something.

But, that is just me being stupid and funny anyway. I know the real technical reasons for the changes in the movies but, like tossing around stupid ideas...it's fun.