Are the rear turn signal lights amber or red?
I have to agree with your evaluation, however I would have preferred the amber rears myself.It seems the trend for most higher end European vehicles for the North American market is red. BMW for instance use to have amber but now is all red and I believe that is the case also for MB.
Why this is the case who knows. I am sure if you asked engineers from BMW and MB why the switch to red they would likely tell you they have conducted extensive studies of North American drivers, as opposed to European drivers, as to reaction times to turn signal colors and North Americans react quicker to red and Europeans quicker to amber. They always have a rational for this type of thing.
The real reason likely is just a style thing of the moment. Jaguar is just following the trend.