Consider if you could endure the endless glare from the COMAND console if you had to do a long highway trip at nightfall...it makes sense that it should switch to the blue background versus amber during the day...

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car