Or, more to the point, why didn't folks like Fred Bear silence theirs?
I was thumbing through a book about Fred Bear and I noticed that his bow just had a bare string. In all the pictures of him, old or young, posing with deer or tigers ... bare string.
Then I looked at the Schafer Silvertip website. Looks like the same thing in the pictures of Paul Schafer. Bare string.
So I took my most quiet recurve, put a bare string on it and ... it sounded like crap. Heavy arrow, lighter arrows, lower brace, higher brace it didn't matter. Much, much louder with the bare string; almost a bang.
I can't imagine it never occurred to Fred or Paul to twist some yarn on their strings. I can only assume they didn't want or need it. Were their bows that much better tuned?