On the ground, and rules aside, ground staff who see an aircraft with it's anti collision lights displayed know not to approach the aircraft, and expect it is about to move, as do other pilots unless otherwise advised by atc.
If posssible, strobes should not be selected until the aircraft is at the holding point and about to depart.
This is due to the possibility of strobe effect in dim light or darkness affecting the spatial orientation of other crews or people on the ground.
Hope this helps.