Always important to check the vanes on a preflight for damage (from Jetway/stairs)…….On most aircraft the stall warning system does not become active until air mode (usually nose gear squat switch). If the vane has been damaged, you might wind up with a shaker on takeoff…..aircraft have rejected for this with some not so pretty outcomes.
This system and airspeed are two of the systems whose operation you can really not check until the aircraft is moving.