What's an F17?
(PS: Yeah, there was one, but never got past the prototype. Lost the competition to the F18.)
I do get your point. But blanket statements like "you'll never get a 14,000 rpm engine to sound good" are equally off-base. Personally I LIKE the sound of screaming, high-rpm engines. You don't. Fair enough.
Why compare a Harley to a high-revving parallel twin in the first place? What's "good" or "bad?" It's in the ear of the listener.
A chainsaw sounds the way it does in large part because it's a single. I happen to think that the RC390 sounds like a chainsaw for that reason. But once you get into different engine configurations the character changes. The Ninjette doesn't sound anything like a chainsaw to me.