This is actually my first car with indicators in the wing mirror.
To me its just for style and cost reduction, what was wrong with an indicator in the side of the front wing, apart from probably being a little dearer to install.
Its also the first car for a very long time with the mirror mounted into the door rather than the quadrant, which is my preferred position, again I think its just for style the way its fitted now, and again it makes no sense to me, fitting a mirror into a thin door skin then having to fit extra structural brackets just to stop them shaking?, so no weight reduction and maybe extra install costs?
My Xtrail had a very annoying vibrating interior rear view mirror, the first on any car I've had, so I know how annoying it must be for those with vibrating wing mirrors, luckerly mine are ok, I do get movement when towing due to clamping on extension mirrors but little more than previous cars, if I did have the vibrating wing mirror problem i'm afraid the car would have to go, failing any attempted repair.