Pax vobiscum folks! 🙂 The topic is Lane Assist, which I, personally, as stated above, find useless, and frequently irritating. I just don't like the car trying to tell me where, on the road, it "thinks" it should be, because it actually knows nothing of the road ahead except where the (often barely visible) lane markings are, whereas I can see the roadkill and the potholes etc. that I want to dodge, and the line I want to take through a bend, etc. etc. So, I turn it off. That is me. Others, inevitably will be different.
I am unaware that failing to indicate to change lane on an empty road is an offence. However, that does not mean that I do not indicate to change lane when there is following, or preceding traffic. Signalling is a communication. But to communicate, there has to be a recipient.
That does not mean I do not indicate right or left turns at junctions because the road is at that instant clear, because a) one slows to negotiate junctions and others, who may not be turning do not, so the actual traffic conditions can change very fast and b) there may be pedestrians or cyclists that are not initially visible on approach to the junction. But again, that is me. Driving is an observing, anticipating, thinking, and deciding activity and it is inevitable that we are all going to do it in slightly different ways. Horses for courses?