Dimming dash warning lights

Why do the dash lights for the high beams, 4WD, O/D OFF (in older models) and such not dim with the rest of the dash lights. Any light/icon that could be illuminated while driving for long periods, that is not a "something is wrong" light should be dimming with the rest of the dash lights. A bright blue or yellow light in the middle of the gauges in a dark night driving setting is more of a distraction when less distractions are needed.