I have one fitted on the bars of a XT225 - it came like that when I bought it, so I haven't thought about it much. Seems to me that it must be inserted into the headlight circuit because that is all that it controls i.e. the backlight always comes on when the ignition is activated.
The headlight switch is just a simple on/off press button thing - very light weight, very simple and yes I like it for the same reason; I want control of when the headlight is shining out there.
Military vehicles tend to have a similar arrangement with control of the brake lights as an option as well.
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Dave
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