Another practical value I can see is if you are going out with another couple at night, they are not familair with the height and the positions of the steps, especially older folks but equally dangerous for young ladies in evening dresses too, the underbody light can be quite useful as safety feature. I've seen too many times first time passengers searching for the door handle to get out, or fishing for the step or ground and missed the step. One slip end in broken/twist ankle is all it takes to mess up peaceful life for weeks/months. If nothing else, you don't want them to step on the wrong place and scratch your paint.
Multi-colors is silly and childish, simple white or blue light is good enough for me.
If blue light on vehicle is illegal, do you think just white underbody light on pavement is legal?
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