That's not really a bias, it's just physics.
Lighter tones absorb less light/reflect it better, so it's easier to make out detail, and darker tones absorb it. It's the same as any other photography (basically what this is relying on), light is the photographer's friend. Sure you can bring up the exposure to brighten anything, to make anything easier to see, but the darker it is, the more noise (error) you're going to get.
To get something which effectively works with lower light, and which is fast enough not to be blurred is extremely expensive for the lens.