This brings up the valid point not just about the aircraft but the pilots too... I notice in the UK that most pilots don't seem to bother with position lights in the day (even when conditions are poor) , don't use the landing light at all, and often even if white strobes are fitted don't bother using them either!
My personal preferance is to always have the position lights on, white flashers if fitted when airborne, and landing light on when coming into land or if ATC pass possible conflicting traffic info... Can never have too many lights!