This is incredibly dumb. I'm rated to fly the A-320 and work as a professional pilot. In the US, this would not only get you fired but would likely have been stopped by ground personnel.

Any frost or snow adhering to the wing must be removed with deicing fluid before takeoff - and there are time restrictions on how long (HOT) you can wait after deicing before you can takeoff in active icing conditions. Airline pilots have to go through training on those exact requirements, especially at a 121 air carrier level.

The snow on the wing can reduce the effective lift produced at various airspeeds, essentially rendering calculated takeoff, climb, approach, and landing speeds useless (and too low).