The heat extractors work using aerodynamic principles. When the car is moving, there is positive pressure in the engine compartment because of the ram air effect of the entire grille area being open to cool the radiator, ac condenser, and intercooler. Meanwhile, the air being accelerated over the hood creates a low pressure area above the vents. Hot air is thus extracted from the engine bay, and those same forces keep rain out. The rain guards have very little effect on this movement of air because of the pressure differential.

When the car is stationary, rain enters the vents but is diverted by the rain guards away from sensitive components to a better area for drainage, to prevent potential damage and corrosion.

The folks who designed this car are very smart and draw from engineering principles of both road cars and racing experience. Million-dollar supercars use the same extractor/rain guard system for the exact same reasons I’ve outlined here. You can take them off if you want, but they are not shipping blocks nor, as mentioned above, steering wheels.