Front cover grille horn nose Vespa S matt black

Why exactly do I have a grill or grill?

The grille/grill in your front is not only visually fun, but it is often also useful. For a number of scooters there is a radiator behind it for cooling the engine block. This is the case with the Yamaha Aerox, for example.
The reason that the radiator is there, of course, is because that's where all the fresh wind comes along to cool the radiator!
Then comes the utility of the grill or grill that is in the front: protection of the radiator against stones, twigs, precipitation and so on.
When you don't have a radiator behind your front front, the grille protects all kinds of cables and frame tubes from damage.
When a piece breaks out of your grill, it is smart to replace it, because there is a high cost when a radiator, frame parts or cabling needs to be replaced, for example.