It does not really matter where it is, as it is overall ratio for transmission to be set low or high or something between on that.
But yeah, why it is set on there? Is it due its easier to do, or it is more clearly? Or is just simply of some people makes setups so?
Or, is there actually really a benefit reason about why?
EDIT: Yes, I know, my reply is awkward, but I did post exactly how I thought.