Do you flash people?

So this whole light flashing/blinking deal started many moons ago when big trucks had a lot less power and the average road was 2 lanes not 4. If and when a bigrig could pass it was advantageous for the driver to know exactly when to move back into the proper lane usually due to possible oncoming traffic. Dipping the headlights was "clear to come back" and blinking the clearance lights was thanks for the break. Doesn't he know how long his rig is usually but at night or in the rain or snow it can be iffy. Also we are in such a hurry anymore to return to the right lane we don't give a good distance to move back over properly. Generally if you don't mover over right away some wonderful jerk cuts to the right beside you to pass on your blind side. Now we flash our high beams blinding the driver ahead because the OEM flasher designed for European passing is used instead of dipping the lights. Also having daytime running lights complicates things with the high beams on at reduced amperage on a lot of vehicles to accomplish this. Personally when RVing I prefer they just pay attention to the road and I will choose when to pull back in on multi-lane roads.