The ambient background lighting causes an orange and blue tint to go on all of the objects in a scene. While, this isn’t that big of a deal it causes colors to be inaccurate. Most noticeable, white always appears slightly orange. This lighting causes the most issues when you Change the background color, as the ambient lighting remains orange and blue, which doesn’t match the background.
Personally, I believe it would be best if there were a toggle to disable this lighting.