Power Head Speed button- not the trigger

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Wondering how that speed button on the Powerhead really works. I see the explanation of a 6k, 7k MAX on another thread but.... that's not really an answer as the PH has a variable speed trigger able to accomplish almost the same....
The manual offers very little description explanation

 Is it a reduction gear- guess not by the flimsy feel....(but it should be!) so higher torque attachments that need less speed but more torque-could really benifit and not stress the motor as much- especially job dependent.
 I mean edging black earth is easier than edging on clay, hedge trimming cedars is tougher than say tramming a  hydrangea bush . and yes I do realize the attachment has final gearing to compensate for a certain amount of torque needed.
I guess what i'm really asking: Is there an advantage to using speed 1 on higher torque consuming attachments/jobs to lessen the load on the motor/battery?  say a speed 1 for hedge trimmers, pole saws,maybe edger, speed 2 for weed whacker  etc? 
like most humans, I personally still have quite a bit of self control with the  trigger finger so why the need for the speed switch limiter if it is really just a fancy trigger block? and that be it only reducing top speed by 1k (~15%)  with no torque or power multiplying advantage? explanation? is it just really more for show? 
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David

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Posted 4 months ago

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Blue Angel, Champion

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Official Response
It is just an electronic limiter for the tool’s maximum speed. Torque is the same in either position.