Historically, bright colors have always helped "make the sale" when it comes to train sets. I did a search for Jersey Central Blue Comet on Google, and the colors of model trains were all over the place.
As a long time bona-fide buyer of starter sets - even though the color maybe wrong - it doesn't bother me that much for this particular set. Although the prototypical color is a darker blue, and I believe it is two shades of blue, not the blue and black used here.
The color as is reminds me of Conrail blue and appears to be the same color used for the LionChief Plus Pacific Blue Comet engine. And as MartyE seemed to suggest with his observation, I doubt too many people who are potential buyers of this set are going to be too disturbed over the color.
And yes, some of the color issues Lionel has had, especially with more expensive high-end products, are disturbing to those buyers who want more accuracy. And of course, Lionel touts the prototypical accuracy with their catalog descriptions, even though there's the ever- present catalog disclaimer.
That's part of the problem with your vendor factory being overseas. But even MTH and Rapido have had their difficulties and unlike Lionel, they both own their own dedicated facilities in China. Often in people's displeasure with these products we read the words "with what we pay for these trains." Of course, you wouldn't even have most of these scale products were it not for overseas production.
Really though to a large degree what you're paying for, is the privilege of getting a highly detailed scale proportioned train, most likely from recent tooling that may not have recouped its' initial investment in and of itself, and is produced in very, very small production runs.
I can't imagine Joshua Cohen giving a green light to a production run of 25 units, other than a factory test run (or an error)! Same for Lionel during the MPC years. They wouldn't have even considered a production run that small.
And in case no one has noticed, the current prices of the traditional Lionel products are not that far behind the scale versions, and some cases, exceed the scale product prices. And the prices for starter sets have gone up considerably too, given the production and shipping savings from eliminating the transformer from the sets.
Just sayin... no one is forcing any one of us to buy these trains. You'd think the mistakes would have already killed the high-end market, but obviously not.