Those motorcycles definitely exist, and are pretty much just as much fun to ride as the noisy ones - except for the extrovert, obnoxious, or insecure riders who _need_ noisy exhausts.

At least here in Australia, any new bike you buy off a dealership has to meet the noise regulations, and under normal use they're almost as quiet as modern cars. The noisy ones you hear are all modified or old, perhaps both (a bike needs to be pre 1972 in Australia to be completely exempt from modern noise restrictions.)

There are even fully electric motorcycles available, but they're really not prime time "just go down to a dealer and buy one, and get it serviced everywhere" ready yet.

(Full disclosure, 2 or my 5 motorcycles have noisy exhausts. Not "hear from half a kilometer away" loud, but technically illegally loud and definitely loud enough that I take extra care arriving or departing home very late or early, out of respect for my neighbors. Interestingly for this discussion, the 3 bikes with quiet, factory stock, 100% road legal exhausts are all Japanese - in fact all Hondas. The noisy bikes are both Italian - a Ducati and a Cagiva.)