Fast forward and everyone is driving nearly silent electric vehicles. I wouldn’t want loud Vespas then. Cutting city noise pollution is one of the benefits of electric vehicles.
Anyway, don't most places legally require nearly silent electric vehicles to emit some kind of artificial noise?
People who sleep with the windows opened in summer at night(most Europeans) facing the street where vespas are driving would beg to differ.
Then there's the separate issue that some(many?) owners either rev their vespas for more power(maybe due to worn belt) or they just fuck with their exhaust to squeeze more power at the expense of noise.
Either way, there's plenty of good reasons people find mopeds/scooter overall far more noisy and annoying than cars.