When I was taught to fly I was told to switch the strobe on before engine start or I was not insured if someone walked into the prop. The strobe caused some interference on the intercom so we would switch them off at the hold and back on again as we vacated the runway.
At my current Club it is verboten to have them switched on until you reach the hold, and you must switch them off as you vacate the runway.
It is a funny old world.
Rod1