Thanks for all the feedback
Perhaps BMW rocket-scientists should make retractable ones ..then you would have a choice depending on how you feel that day (and if its dry or wet) - and you can code it into your comfort access settings
Think through the scenarios e.g. solo trip to morning peaceful coffee (off), wife picking up kids from school (on), loading stuff on roof (on), knocking over abusive cyclist as he/she approaches from rear (off then quickly on as they pass), police arrive (off)
