My main thoughts instantly come to someone in the opposing left turn lane, if they are not applying the brakes they are likely starting to turn and if they do it right in front of you, you have more of a heads up than just them starting to turn and can set yourself in a better position to hopefully stop in time. Driving is all about judgment calls and having more info quicker is important to those calls.

The diagram from your service manual should say what each wire is so dip from bike to low from headlight, main to high, negative/ground/common to ground, and position to position, again daytime running lights(drl) is not really a thing on us models despite having the wire for it. Here is the diagram from my bike and how i hooked it up to the very same light that you are putting in

So if its like my triumph, there should be the low beam/dip, high beam/main, ground, daytime running lights which U.S. bikes dont actually have, and im not exactly sure on position lights but seems to be some sort of parking light, i think keeps the light on when the bike isn’t started but i connected it up. I just cut off the harnesses of my factory l.e.d. sealed headlamps since i dont plan to use them since one is bad and soldered it to my jw speaker light so i could just plug it in to the bike side harness, i taped off the day time running lights. Not sure about your bike but the wiring was pretty easy, it was modifying the two mounting brackets where one goes on the back of the light and on on the front side that twist onto each other to then twist and lock into the bucket. Took a lot of grinding, glue and curing time but im happy with the results.