Well I only noticed how much less efficient the "functional" code is, downright wasteful even. And nobody is going to tell me that this:

  def move_cars():
  for i, _ in enumerate(car_positions):
      if random() > 0.3:
          car_positions[i] += 1

..is not way more readable and clear than this:

  def move_cars(car_positions):
      return map(lambda x: x + 1 if random() > 0.3 else x,
                 car_positions)

If you ask me the article makes a good argument against functional programming.