In this day and age of the so called nanny state we forget, I think, that electronics are a servant and only as good as the designer. If we had lights that switched on every time needed surely we will be in the realms of being redundant. The boffins are hell bent on producing 'thinking' robots BUT when they can produce one what will happen? will those thinking robots decide to do away with us mere humans.
Seriously chaps, I am as guilty as the next in cursing the fact that the automatic action of the lights is a bit hit and miss but we, I think forget that the human eye is pretty remarkable and at the moment impossible to replicate. We assume that the sensor is as sensitive as the human eye but it's not.
I am a bit surprised at the remark that the only way to tell if the lights are on is when the aircon temp goes dark. Surely there are tell tale lights on the speedo.
As to flashing headlights to other motorists, an absolute no no when I was taught to drive fast cars. If you wish to warn other motorists the 'audible warning instrument' is the chappie. NOT to be used as it is now, as a greeting!!!!!
If you are waiting to enter a road from a junction, even if the other chap flashes/indicates what ever, if you do move into their path with the resultant collision. YOU will be to blame. I remember our instructors favourite expression. 'Treat everybody as an idiot and you might survive.' This will produce some interesting comments I am sure.